The breakdown of a relationship can be one of the most stressful periods in a family’s life, and decisions about where children will live and who they will spend time with are often the hardest. One of the issues that parents commonly worry about is whether the children will be split or kept together. This is especially important when siblings are of different ages, have different needs, or express different preferences about who they want to live with.

There is no automatic rule that siblings must be kept together. However, keeping siblings together is generally viewed as being in their best interests, all other factors being equal. The law places the children’s welfare at the centre of every decision.

The child’s welfare comes first

The law that governs arrangements for children after separation is the Children Act 1989. Under this Act, courts must consider the welfare of the child as the paramount consideration. That means judges look at what will benefit the child most, not what the parents want, and not what the courts think is fair between the adults.

Courts will consider a range of welfare factors, including the:

  • Child’s age and sex
  • Child’s emotional needs
  • Child’s physical needs
  • Benefit of living with each parent
  • Child’s wishes and feelings (depending on age and understanding)
  • Any harm the child might suffer in a particular arrangement

Importantly, the welfare checklist set out above does not say siblings must live together. Rather, it gives the court discretion to determine what arrangement works best for each individual child based on the whole picture.

Are siblings always kept together?

There is no legal presumption that siblings must be kept together. However, there is a very strong starting point that keeping siblings together is usually beneficial. Brothers and sisters often provide emotional support, stability, identity, continuity, and comfort, particularly during stressful changes such as parental separation and divorce.

In practice, judges, mediators, solicitors, and children’s professionals give significant weight to the value of sibling relationships. But it is not absolute.

Circumstances where siblings might be split

Professionals and courts may agree siblings should not live together if:

  • There is a history of abuse between siblings
  • One sibling’s needs (e.g., disability or mental health needs) are very different to the others
  • One sibling has a particularly close relationship with one parent, distinct from the others
  • The house size or practical constraints make living together genuinely unworkable
  • The children themselves express clear and independent preferences, that meeting their welfare requires separation
  • There are safety concerns linked to behaviour, risk, exploitation, or harm between siblings

In these kinds of cases, the court may decide that separate arrangements increase the overall welfare of each child.

Does age matter? What about age gaps between siblings?

Although age matters to a degree, there is not a set formula.

  • Younger children and sibling bonds: For younger children, especially those between 5–7, courts and professionals tend to see siblings’ presence as stabilising. Breaking those bonds at an early age can, in some cases, lead to attachment issues or emotional harm.
  • Older children and preferences: In older children, especially teenagers, the court may give more weight to the child’s own wishes and feelings. A 16-year-old may be allowed to express a clear preference if they want to live with one parent even if their brother or sister wants something different. In such cases, the judge tries to balance between the child’s autonomy and the welfare checklist.
  • Large age gaps: These may influence practical arrangements, for example, older siblings having school commitments, friendship groups, or social lives that mesh differently with parents’ schedules. However, age gap alone is not usually a reason to split siblings unless it directly affects their welfare.

How are decisions made?

Most arrangements are agreed between parents without needing a court order. These are frequently worked out through:

  • Negotiation between parents
  • Family Mediation
  • Solicitor-assisted negotiation
  • Collaborative law processes

If parents can agree, they can record arrangements as:

  • A parenting plan (non-legally binding but helpful)
  • A consent order (court-approved and enforceable)
  • A separation agreement (not legally enforceable of itself but can form part of a consent order)

If parents cannot agree, one or both may apply to the court for a Child Arrangements Order, which will decide where each child will live and spend time.

What if one parent does not agree?

If one parent wants the children kept together and the other parent does not, the law does not automatically side with the parent who wants them together.

Instead, the court carefully considers all welfare factors and the evidence brought by both sides. The court will make a decision based on the best interests of each child, not family convenience.

Do children have a say?

Children do have a say in decisions about where they live and who they spend time with, but the weight of their views depends on their age and maturity.

There is no fixed age at which a child’s preference wins, but generally:

  • Younger children’s views are considered but given less weight
  • Older children, especially teenagers, may have significant influence

In many cases, Cafcass officers speak to children privately to understand their perspectives and report back to the court.

It is important to remember that a child’s view is only one factor among many, and does not override the court’s welfare assessment or what is best for their wellbeing overall.

Who influences the court’s decision?

CAFCASS (Children and Family Court Advisory and Support Service) plays a central role when court applications are made. CAFCASS officers:

  • Assess the family situation
  • Interview parents, children, and sometimes teachers or other professionals
  • Prepare a welfare report for the court
  • Make recommendations about living and contact arrangements

Their reports are confidential and help the judge understand the children’s needs and family dynamics. The judge may adopt some or none of the recommendations, but this is rare.

Other professionals, such as social workers, psychologists, or educational specialists, may also provide evidence if there are specific concerns.

Can a split between siblings be temporary?

Temporary arrangements are often used while a family adjusts to post-separation life, or while waiting for a final hearing.

Examples include:

  • A temporary live-with arrangement for one term or school year
  • Gradual transition plans (e.g., weekends with one parent before full change)
  • Review periods, after which the arrangement is reassessed

This flexibility lets families trial arrangements and gives children time to adjust.

Can contact between siblings be formalised?

The family court has the power to structure and record sibling contact in much the same way as it does arrangements between a child and a parent. If it is considered to be in the children’s best interests, the court can set out clear and defined arrangements to ensure that the sibling relationship is maintained and supported.

These arrangements might include regular weekend visits so that the children continue to spend consistent, meaningful time together. The court can also build in contact during school holidays, which may allow for longer periods together and help preserve a sense of normal family life.

Where distance or practical challenges make face-to-face contact difficult, virtual contact,  such as scheduled video calls, can be included to ensure ongoing communication. In situations where there are safeguarding concerns, or where the sibling relationship has previously been strained or harmful, supervised contact can also be ordered to ensure that time together is safe and appropriately managed.

A judge may also include specific directions addressing sibling time as part of a broader decision about living and contact arrangements. Formalising sibling contact can provide clarity and reassurance, reduce the risk of future disputes, and, most importantly, protect the bond between brothers and sisters where separation has occurred for welfare or practical reasons.