What the data actually shows
Studies of sibling relationships across the lifespan, including the long line of work by Victor Cicirelli, describe a wide spectrum of closeness rather than a norm. Some adult siblings are deeply involved in each other's lives; others are warm but distant; others are indifferent or estranged. Researchers consistently find this variation is the rule, not the exception.
The same research suggests sibling closeness often follows a rough arc over a lifetime. Bonds are frequently strong in childhood, then tend to loosen in early and middle adulthood as people are absorbed in their own partners, children, and careers, and can strengthen again in later life as those demands ease and people lean on shared history. So a period of distance in midlife is a common pattern, not necessarily a permanent state.
Estrangement specifically is part of the broader picture of family estrangement studied by researchers such as Karl Pillemer, whose work suggests that estrangement from a relative is more common than people assume and frequently hidden because it carries stigma. Sibling distance and estrangement commonly trace to long-standing rivalry, value differences, conflict over caregiving or inheritance, or simply growing into very different people.
Why this feels different from how it actually is
It can feel abnormal because the dominant cultural story treats siblings as a guaranteed lifelong bond, and holidays, social media, and family expectations tend to showcase the close families rather than the distant ones. You rarely hear someone volunteer that they barely speak to their brother, even though that is common, so the distance you feel can seem uniquely yours.
Family estrangement and sibling distance are also quietly stigmatised, which keeps them hidden. Because people who are not close to their siblings tend not to talk about it, the visible sample skews toward closeness, manufacturing a sense that everyone else has the warm sibling relationship you don't.
There is also a tendency to compare the present to an idealised past. Many siblings were close as children, so the natural loosening of those bonds in adulthood can feel like a loss or a failure rather than a normal life-stage shift — even though research suggests this dip is one of the most common patterns there is.
Not being close is neither rare nor a sign that something has gone wrong with you.
What the research says to do about it
The research does not prescribe a level of closeness, and the first useful step is to drop the assumption that there is a correct one. Sibling relationships are voluntary in adulthood, and a relationship that is distant but cordial, or limited to particular occasions, is a legitimate outcome rather than a problem to be fixed.
Where someone does want to rebuild a sibling bond, the literature on family relationships suggests that modest, low-pressure contact and realistic expectations tend to work better than attempts to force intimacy. Shared history can be a foundation to reconnect over, but trying to manufacture the closeness an idealised version implies often adds strain.
It also helps to recognise that closeness can return. Because sibling bonds often strengthen again in later life as life demands ease, a distant patch in midlife does not foreclose a closer relationship later. This is general context rather than a guarantee — every family is different, and persistent conflict or estrangement that causes real distress can be worth exploring with a counsellor.
What the research says does not help
Forcing closeness out of obligation tends not to help and can deepen resentment. The 'but they're family' pressure to maintain intensity neither matches how varied sibling bonds actually are nor repairs the underlying reasons for distance, and it can keep people locked in a draining dynamic.
Comparing your sibling relationship to idealised versions — the close families you see at gatherings or online — reliably manufactures a feeling of failure at a perfectly normal level of distance. The visible sample is skewed toward closeness, so the comparison was never against a true average.
Assuming distance is permanent, or treating it as proof that something is wrong with you, is also not supported by the research. Sibling closeness commonly shifts across a lifetime and dips in midlife for ordinary reasons; reading a current gap as a fixed verdict misreads a normal, changeable pattern.
You rarely hear someone volunteer that they barely speak to their brother — so the distance you feel can seem uniquely yours.
What this looks like in real life
Close as kids, distant in your forties
You and your brother were inseparable growing up, and now you exchange a few texts a year. That can read as a loss or a failure — but it is one of the most common patterns there is. Sibling bonds frequently loosen in early and middle adulthood as people are absorbed in their own partners, children, and careers, and often strengthen again in later life. A distant patch in midlife is usually a life-stage shift, not a permanent break.
The gathering where everyone else seems close
At a family event, other people's siblings look warm and effortless, and yours feels strained by comparison. The visible sample is misleading: distance and estrangement are quietly stigmatised, so the people who aren't close to their siblings tend not to talk about it. The warm relationships are the ones on display, which makes an entirely normal level of distance feel uniquely yours.
Real numbers in context
There is no single 'normal' level of sibling closeness — the defining finding across the research is the breadth of the range, from very close to estranged, with large numbers of people sitting in the warm-but-not-close middle. Any precise share is hard to pin down because closeness is measured so differently across studies, but the variation itself is the most robust result.
On estrangement specifically, surveys of family estrangement suggest it is more common than people generally assume and frequently kept private. Exact figures vary by definition and country, so treat any single number with caution, but the consistent message is that being distant from or estranged from a sibling is far from rare. Whatever your level of closeness, you are almost certainly somewhere within the normal range.