Who's the Favorite? by Catherine Carr The Loving, Messy Realities of Sibling Relationships

What's it about?

Who’s the Favorite? (2026) explores how sibling relationships shape our identities, tracing the roles, rivalries, loyalties, and shared histories that can bind brothers and sisters together or drive them apart. Drawing on interviews, research, and cultural examples, it examines themes like sibling labels, friendship and conflict, shared trauma, family language, and estrangement to show why these bonds can be some of the most formative relationships in our lives.

Narrated by…. Few relationships begin earlier, last longer, or carry more emotional weight than the one between siblings. If you have a brother or sister, chances are they were part of your first lessons in closeness, jealousy, loyalty, competition, and belonging. Even when those bonds fade into the background of adult life, they can still shape how you see yourself, how you handle conflict, and what home means to you.
Yet sibling relationships are often treated as secondary beside parents, partners, and children – as if they matter less simply because they are so familiar. In this lesson, you’ll learn how sibling dynamics start early and can echo through adult life. You’ll see why birth order and family labels can be so powerful, how siblings sometimes become true friends, what happens when one child’s needs dominate family life, and why estrangement and bereavement can leave such deep marks. To begin, it helps to start with one of the oldest ideas about siblings: the position you occupy in the family from the day you arrive.
Birth-order stereotypes stick around for a reason: they feel familiar. Without much effort, you can probably picture the responsible oldest child, the overlooked middle, and the charming youngest. That intuitive pull helps explain why these ideas have lasted for so long. Early theories from psychotherapist Alfred Adler gave them shape, describing firstborns as dutiful and burdened, youngest children as more carefree and risk-taking, and middle children as adaptable but sometimes hungry for significance.
Later, psychologist Frank Sulloway argued that children try to stand out within the family by carving out different roles, especially when they’re competing for attention and approval. But once you move past the stereotypes, the picture gets messier and more interesting. Large-scale research discussed here found no clear link between birth order and the major personality traits. Simply being born first doesn’t reliably make you more conscientious, and being the youngest doesn’t automatically make you more outgoing. One major study did find a slight firstborn advantage on measures related to self-reported intellect, and research on Norwegian brothers found a small average IQ edge for eldest children. Even so, the argument isn’t that birth order directly produces intelligence.
Family expectations and environment matter a great deal, which helps explain why, in families where the firstborn was no longer present, second-born children who grew up as the oldest living child often showed patterns closer to firstborns. That leads to the more useful idea: birth order matters because it changes the setting in which you grow up. The first child gets a period of exclusive adult attention. Subsequent children enter a busier household, where time, money, and energy are divided more ways. Age gaps matter too. Wider gaps can reduce rivalry and make younger siblings more likely to listen to older ones.
Culture matters as well. In some places, older children are pulled out of school first to support the family, which can reverse the expected pattern. So, birth order isn’t destiny. It’s a starting position, shaped by timing, family structure, and circumstance. And because families often turn that starting position into a label, the next thing to look at is how those labels can follow you long after childhood ends.
The labels you were given at home may still shape your life long after childhood ends. Therapists and sibling researchers make the same basic point: the patterns formed between brothers and sisters don’t stay sealed in the past. They can follow you into adult relationships, work, confidence, and conflict. If you were treated as the sensible one, the difficult one, the funny one, or the needy one, that role can start to feel less like a family reference and more like who you are.
Part of the reason is that sibling identity is always relative. Inside a family, you’re rarely measured on your own terms. You’re measured against the child beside you. That comparison can shape how ambitious you feel, how lovable you think you are, and what kind of place you believe you’re allowed to occupy. If one sibling is treated as the clever one, another may stop competing in that area and look for a different way to matter. Those old positions can stay surprisingly active, so that even much later, criticism from a boss or tension with a partner can stir up the same feelings of being overlooked, blamed, or second best.
Children aren’t just passive recipients of these roles. Research on sibling differentiation suggests that they often spread themselves out across the family map. When one child becomes known for being responsible or high-achieving, another may lean into being creative, sociable, unruly, or laid-back. That process often intensifies in adolescence, when standing apart from your siblings starts to matter more. In that sense, family labels are partly assigned and partly claimed. Children adapt to the system they’re in and try to secure a place that feels safely their own.
Parents still have enormous power over how fixed these roles become. When comparison is constant, the parts can harden into painful identities: the golden child, the invisible child, the caretaker, the clown, the black sheep. Once you see those roles clearly, you can begin to question them. And that opens the door to something better. In the next section, let’s look at how siblings can move beyond those old identities and become real friends.
Siblings do not begin as friends. At first, they’re simply part of the furniture of your life: there at breakfast, in the back seat, in the next bedroom, in your arguments and routines – whether you like it or not. That’s what makes the later shift so striking. In one study of adult sibling relationships, around half of the people surveyed said a sibling was their best friend.
Somewhere along the way, a relationship that began without choice had become one of the most freely valued bonds in their lives. That change often seems to happen in adolescence. Before then, brothers and sisters mostly know each other inside the family setup, where roles are fixed and irritation comes easily. You’re seeing each other under old labels and through your parents’ gaze. Then, as teenagers, you start to notice your sibling as a person outside the family story. You see them with other people, in other settings, acting in ways that don’t fit the version you grew up with.
Researchers argue that this is when the relationship can start to feel voluntary. It becomes more like a friendship because you’re relating as peers, not just as children in the same home. That chosen closeness can become especially valuable later on. When middle-aged adults were asked who they could call in the night if they were ill or frightened, many named a sibling. That says a lot about the kind of trust these relationships can hold. A sibling may know your history in a way no friend or partner fully can.
They remember the family rules, the private jokes, the old versions of you, and the events that shaped your home life. Even when siblings remember the past differently, they still carry parts of the same story. Shared nicknames and family phrases can hold that history in miniature, bringing back warmth, intimacy, and the sense of belonging to the same small world. Sibling friendship isn’t guaranteed.
But when brothers and sisters are allowed to outgrow their old roles and meet each other more openly, affection has room to deepen. In the next section, let’s turn to a more uneven kind of bond, where love and loyalty are shaped by responsibility, strain, and being overshadowed. Ever heard of a glass sibling?
The term sounds as though it should mean fragility, but it points to something different. It describes a child who is overlooked because so much family attention is directed toward a brother or sister with additional needs. These siblings are often capable, loving, and dependable. That can make them easy to miss.
They learn to stay manageable, ask for less, and make themselves useful, even while carrying worry, anger, sadness, protectiveness, and guilt that may go largely unspoken. Schools and wider communities often miss this hidden pressure too, even though many of these children are balancing family strain with the ordinary demands of growing up. That’s why glass siblings are so vulnerable to parentification. Parentification happens when the usual boundary between parent and child starts to blur, and a child is leaned on for practical care or emotional support that should mainly come from adults. Once a child is known as the one who copes quietly, they may begin filling gaps in family life by helping with a sibling’s care, managing emergencies, steadying the mood at home, or absorbing worries that are too heavy for them. In families where one child has significant needs, this can happen gradually and start to seem normal, because the sibling who is able to help often becomes the sibling who is expected to help.
Sometimes that means concrete tasks, but often it means something less visible: giving time, patience, emotional steadiness, and understanding beyond what should reasonably be asked of a child. The wider family climate makes a huge difference. If parents can speak honestly, make room for mixed feelings, and avoid tying a child’s worth to how helpful they are, the bond between siblings can remain loving and even grow stronger. If support is weak and one child’s needs swallow the whole household, resentment and exhaustion can creep in. So the answer isn’t to romanticize these siblings as little heroes, but to notice them, support them, and let them be more than the role they’ve been forced to play. Now let’s turn to what happens when sibling bonds become too strained to hold.
Sibling estrangement is far more common than most families admit. Psychotherapist Ali-John Chaudhary, who runs an online community for estranged siblings, describes it as a silent epidemic. That phrase fits because the people living through it often feel ashamed as well as hurt. Outsiders may imagine family cutoffs as cold or impulsive, but the picture here is very different.
Estrangement is usually shown as something painful, prolonged, and emotionally draining, shaped over years rather than decided in a moment. It also comes in different forms. For some siblings, the relationship becomes openly broken. For others, it survives as a thin social performance, with occasional cards, polite messages, or family appearances but very little real closeness. And sometimes the pain comes from a mismatch rather than a dramatic rupture. One sibling wants depth, honesty, and emotional connection, while the other is content with distance and light contact.
When those expectations don’t match, the relationship can feel strangely hopeless, because both people think the other is asking for the wrong thing. The causes are varied, but some patterns stand out. Sibling aggression and abuse are often minimized as ordinary rivalry, even though harmful behavior between brothers and sisters can be severe and long-lasting. Parents can make matters worse by failing to set limits or by pressuring adult children to keep up the appearance of harmony. Favoritism is another major fault line. Research on parental differential treatment shows that when one child is consistently favored through approval, attention, money, or tolerance, sibling warmth tends to drop and hostility tends to rise.
It also affects mental health, leaving the unfavored child with wounds that can last well into adulthood. That’s why estrangement isn’t neatly solved by telling siblings to reconcile. Sometimes honest conversation may help, especially before resentment hardens or parental loss removes the structure holding the family together. But some relationships are too damaging to continue.
Even then, distance rarely feels simple. It can bring relief, grief, and a lingering sense of incompleteness all at once. In the final section, let’s look at another form of loss that sibling relationships can carry: bereavement.
Imagine being 14, standing at your older brother’s grave, desperate for someone to notice that your world has also collapsed. Instead, an adult takes your arm and tells you that your parents are going through so much, so you need to be especially good. That scene gets to the heart of sibling bereavement. Brothers and sisters are often expected to hold themselves together while the family’s attention settles on the parents’ devastation.
Their grief is pushed to the side, not because it matters less, but because it’s so rarely treated as central. That sidelining helps explain why sibling grief has been described as a form of disenfranchised grief, meaning grief that’s not fully acknowledged or socially held. And yet the loss is profound. A sibling is often your contemporary, your witness, your keeper of family memory. They knew the house you grew up in, the rules you lived under, the version of you that existed before adult life took over. When that person dies, you’re not only losing someone you love.
You’re losing someone who shared your past and was meant to travel with you into the future. That’s why sibling bereavement can feel like a break in the structure of your world rather than a single sad event. The damage can spread further than people realize. Research has linked sibling loss with serious long-term physical and psychological consequences, including impaired relationships, substance misuse, suicide risk, and earlier mortality. Part of the problem is that surviving siblings often become highly alert to their parents’ suffering and push down their own needs. Some even start trying to fill the empty place in the family by taking on traits, ambitions, or responsibilities associated with the sibling who died.
They’re grieving the sibling, but they may also be grieving the version of their parents and family life that existed before the death. What helps is recognition. Sibling-specific support, honest remembrance, and the rejection of any hierarchy of grief can make a real difference. If there’s one final point to hold on to, it’s this: sibling bonds deserve to be taken seriously in life, and their loss deserves to be taken seriously too. The main takeaway of this lesson to Who’s the Favorite?
by Catherine Carr is that sibling relationships are among the most powerful and least examined forces in your life. They help shape your identity early, influence the roles you carry into adulthood, and can become sources of deep friendship, hidden strain, painful distance, or profound loss. Because these bonds begin so early and often last so long, they deserve far more attention than they usually get. If you understand the patterns within them more clearly, you’re better placed to question old roles, value healthy closeness, and respond with more honesty and care to the ties that still shape you.