Marrying when you have children from a previous relationship: what changes legally?
Getting married does not automatically change parental responsibility, child maintenance arrangements or a child's surname — those are governed by separate family law rules. What it can change is things like inheritance without a will, and it does not require you to inform a register office about children at all as part of the notice process.
What marriage does not change
Marrying your partner does not give them automatic parental responsibility for your children from a previous relationship — that generally requires a separate legal step, such as adoption, a parental responsibility agreement, or a court order, depending on the situation.
Existing child maintenance arrangements or court orders about contact and living arrangements are not affected by your marriage and continue to apply as before.
What marriage can affect
Marriage changes your legal status for inheritance if you die without a will — a spouse has automatic inheritance rights that a partner who isn't married or in a civil partnership does not. If you want to protect your children's inheritance specifically, it's worth reviewing or making a will around the time you marry.
Practical steps some couples take
Some couples choose to formalise a stepparent's role through a parental responsibility agreement, update wills, or review life insurance and pension nominations around the time of marriage. None of this is required to marry — it's a personal decision, and family solicitors can advise on the legal mechanisms available.
What this means for you
- Marrying a parent doesn't automatically give you parental responsibility for their children — check the separate legal routes if that's what you want.
- Review your will after marrying, since marriage can revoke an existing will and change automatic inheritance rules.
- The register office doesn't need to know about children as part of the notice process itself.
Official sources
Last reviewed: 17 August 2026 · Next review due 17 November 2026
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Simply Married is an independent planning service, not a register office or government department. Confirm current requirements and fees with your own register office and on GOV.UK.