What makes the twin relationship special
Twins share a lot: often a birth date, a family, a home and many early memories. For many twins, that creates a closeness unlike other sibling bonds. At the same time, each twin is a separate person with their own temperament, strengths and needs. Much of the story of twin relationships is about holding both of those truths together: being close, and being yourself.
Every twin pair is different. Identical twins, fraternal twins, same-sex and mixed-sex pairs all have their own patterns, and no description fits everyone. What follows are common themes described by researchers and by families.
Early closeness
Some researchers and clinicians suggest that twins begin to interact with each other very early, even before birth, and that this can form a first relationship that comes before their relationship with parents. It is a lovely idea, but it is still an area where findings are limited, so it is best seen as a possibility rather than a certainty.
What many parents notice more clearly is the day-to-day closeness: babies who calm when placed near each other, toddlers who play side by side, and children who invent games or even private ways of talking together. If you are in the early stage yourself, our guide to tips on raising twins covers safe sleep, routines and getting support in the first months.
A shared identity and a separate one
Many twins describe having two identities: a personal one and a “twin” one. Being part of a pair can bring a deep sense of security, empathy and a built-in companion. It can also be tiring when other people treat the two as a single unit, for example by using one name for both, expecting them to like the same things, or constantly comparing them.
Counsellors who work with twins sometimes describe a risk of “enmeshment,” where the boundary between the two can blur and one twin relies heavily on the other. This is not inevitable, and closeness itself is not a problem. The concern is mainly when a child has little chance to develop independently. Gentle encouragement of separate interests and friendships helps keep the closeness healthy.
Dominance and roles: what one study suggests
Like many relationships, twin relationships can include imbalances in power. One twin may take the lead more often, while the other follows. A study by researchers in Israel, published in the journal Family Relations, asked more than 1,500 parents of twins aged 3 to 9 about this. A few findings stood out:
- When one twin was developing typically and the other had a developmental condition, parents often described the typically developing twin as the dominant one, and that perception tended to remain over time.
- When both twins had similar abilities, parents reported little difference in dominance, even where both had a developmental condition.
- The researchers suggested that the difference in abilities between the twins, rather than the condition itself, was linked to the imbalance.
- Identical twins were described as more balanced than fraternal twins in this study.
- The authors also pointed to a “contrast effect,” where parents who focus on how different their twins are may unintentionally strengthen those roles.
These findings come from parents’ reports, so they show how parents see things, not necessarily how the children experience them. They also describe patterns across groups, not what will happen in any one family. Still, they offer a useful reminder: the labels we use can stick.
Ways parents often try to keep roles flexible include:
- Noticing and naming each child’s strengths separately, without ranking.
- Giving the quieter or less dominant twin chances to lead, such as choosing the activity or the family meal.
- Avoiding fixed labels like “the leader” or “the baby.”
- Encouraging time with friends and activities outside the twin pair.
Conflict and competition are normal
Twins who spend nearly all their time together will argue. Sharing toys, space, attention and friends can make for intense moments. Competition, falling-outs and even a period of wanting distance, especially in adolescence, are usually described as part of normal development rather than a sign that something has gone wrong.
Some approaches that families find useful:
- Helping each child name feelings and take turns, rather than always stepping in as referee.
- Having duplicates of favourite items, or a clear turn-taking system.
- Making sure each child gets some one-on-one time with each parent. Our look at the advantages of a large family also discusses sibling rivalry and fair attention.
- Avoiding comparisons such as “why can’t you be more like your brother?”
If fighting is frequent, hurtful or one child seems consistently frightened or very upset, it is a good idea to talk to your pediatrician, a school counsellor or a family therapist.
Supporting twins at different ages
Babies and toddlers. Use each child’s own name, offer some separate experiences when practical, and let them show their different preferences, even in small things like food or books.
School age. Parents often wonder whether to put twins in the same class. There is no single right answer. It can depend on each child’s confidence, friendships and school policies, so it is worth talking with teachers and keeping an open mind. Some families review the decision each year.
Teenage years. Teenagers often want more independence, and for twins this can mean separating from the co-twin as well as from parents. This can feel painful for one or both. Reassurance that friendship can continue while paths diverge can help. For help with friendships and confidence at this age, see how to improve social skills in a teenager.
Adulthood. Many twins stay close for life, and others drift for a time and reconnect later. Either can be healthy. Life changes such as moving away, relationships and having children can shift the balance.
Twins and their partners
People who date or marry a twin sometimes describe having to navigate a strong existing bond. Clear boundaries, open conversation and dedicated couple time help the relationship thrive, and it can also help the twin to keep close ties with their co-twin without guilt. This is a sensitive area where couples counselling can help if tension grows.
When to seek support
Closeness, arguments and differences are all part of twin life. It may be worth seeking professional advice if:
- one twin appears very distressed, withdrawn or anxious about being apart;
- there is persistent bullying or control within the pair;
- you are worried about a developmental difference or delay in one or both children;
- you feel unsure how to manage the family dynamics.
Your pediatrician, school, or a family counsellor can listen and guide you to local support.
Short answers to related questions
Readers who land here sometimes have practical newborn questions as well, so here are brief, cautious answers.
How can I pick up two babies at once? There is no single method, and the safest approach is often to avoid doing it alone when you can. Sit down, support each baby’s head and neck, and pick up one at a time if you feel unsteady. Ask a nurse, midwife or pediatrician to show you ways to hold two newborns safely.
What are the first steps to caring for twins after birth? Rest where you can, accept help, keep each baby’s sleep space separate and follow your medical team’s feeding and follow-up advice. Our guide to tips on raising twins covers this in more detail.
What about a “hidden” or undetected twin? Questions about unexpected twins or symptoms in pregnancy are medical, and the right person to ask is your obstetrician, midwife or sonographer. If you have concerns at any stage of pregnancy, contact them directly rather than relying on online information.