A Baby in the Second Marriage: Two Sets of Children

You provide for both families the way you would solve two separate problems: separately. A new baby in a second marriage and the older children from your first marriage do not sit on the same timeline, and almost everything else follows from that one fact. Your first family may be teenagers, or grown and working; their need for your income is ending, or already over. Your newborn needs somebody to pay for the next eighteen years and probably longer. Treating that as one pot of money — a single inheritance to be divided fairly later — is the mistake that quietly leaves one side short.

The instinct behind the mistake is a decent one. One estate, one father or mother, one fair split. But "half each" hands a grown child a windfall while giving a baby a sum that has to stretch across a whole childhood — or it gives the baby what it actually needs and leaves nothing certain for the children you had first. The amounts differ, the timing differs, and the two usually need to sit in separate, named arrangements so that neither family depends on the goodwill of the other once you are no longer there to keep the peace.

Running underneath all of it is a legal trap. Remarriage changes who inherits by default, and it rarely moves in the direction a parent of a first family expects.

The short answer: two families, two finishing lines

Think in dependencies rather than in people. A dependency is a length of time during which someone relies on your money, and it has a start and an end. For a newborn, that dependency runs from now until they can support themselves — the far side of school, perhaps the far side of university, so fifteen to twenty years and sometimes more. For a child of nineteen who is nearly through their degree, the dependency is short and nearly done. For an adult child with their own income, it has ended.

Once you see two dependencies of very different lengths, the shape of the answer becomes obvious. The baby needs a reliable income for a long, predictable stretch. The older children need a smaller, nearer-term amount, or simply a fair share of what you leave. Those are not the same product, they are not the same size, and they are not needed at the same moment. Forcing them into a single figure to be split down the middle after your death is what produces an outcome nobody would have chosen on purpose.

This is the same discipline used whenever a household tries to work out how much cover a parent needs: you start from the gap and the number of years, not from a round number. If you also value the day-to-day work one of you does at home, the exercise of costing what a stay-at-home parent would cost to replace follows exactly the same logic and often belongs in the same calculation.

Why remarriage rewrites who inherits

Most people who marry again do not update their will straight away, and a good number never learn that the marriage itself has already dealt with the old one. In England, Wales and Northern Ireland, marriage revokes any will you made beforehand, unless that will was written in express contemplation of marrying that particular person. So a will you drew up carefully during or after your first marriage — the one that names your first children — is very often cancelled by the wedding, without a word being said.

If you then die before making a new will, the intestacy rules take over, and they are built around the current spouse. Where there are children, a surviving husband, wife or civil partner takes the personal possessions, a fixed statutory legacy, and half of whatever is left; the children share the other half between them. The fixed statutory legacy is a large sum, so in a great many estates the spouse receives most or all of it and the children receive little or nothing.

Source: The Administration of Estates Act 1925 (Fixed Net Sum) Order 2023 set the statutory legacy at £322,000 from 26 July 2023; rules of intestacy published on gov.uk.

You can read the workings of the intestacy rules on gov.uk. The practical point for a blended family is blunt: leave it to the default, and your new spouse is looked after first while the children from your first marriage may be left to hope there is enough left over. That is not usually anybody's intention, and it is the reason cover written in trust is so often used to hold a first family's share entirely outside this machinery. The same problem arrives in a different form during a separation — a spouse you have left still inherits, exactly as a current one does, until the divorce is final, which we cover in separated but not divorced, and your spouse still inherits.

Stepchildren, and the word "children" in your documents

The second half of a blended family is the children who are not yours by birth. If your new spouse has children of their own and you have not legally adopted them, they are not your children in the eyes of the intestacy rules, and they are not automatically included when a will simply says "my children". A stepchild you have raised for a decade inherits nothing from you by default. Only a will that names them, an adoption order, or a claim brought as someone you were maintaining will change that.

This cuts both ways, and it is worth being precise about which way you mean. If you want a stepchild treated as your own, your will has to say so, in words that make clear you include them. If instead you want to be sure your money reaches your biological children and not your stepchildren, you equally need to spell it out, because loose wording and later remarriages can carry an estate somewhere you never pictured. The word "children" is doing a great deal of quiet work in these documents, and it is worth reading yours to see exactly who it is doing that work for.

Sizing the new baby's need as an income, not a guess

The most common way people get the new child's provision wrong is to reach for a single large lump sum and hope it is enough. A lump sum is hard to size — too small and it runs out before the child is grown, too large and it locks away money the rest of the household needs now — and it is genuinely hard for a grieving partner to manage a large amount well while also managing a young child and a job.

For a dependency with a known end date, a monthly or annual income is usually the more honest shape. Family income benefit is built for exactly this: it pays a regular amount for the remainder of a set term, so it maps onto the years your youngest child depends on you and stops when that dependency is designed to end. A surviving parent receives something that behaves like a wage coming in rather than a windfall to be invested, budgeted and defended. You size it from the shortfall in monthly household money, multiplied across the years to independence, rather than from a figure plucked out of the air.

None of this tells you the price of anything, and it is not meant to. What it tells you is the shape of the problem, so that when you get life insurance quotes you can ask a broker to price an income that runs the length of a childhood, not just a round number that feels reassuring.

Keeping the first family's share separate and certain

The children from your first marriage usually need something different: a defined amount, available reasonably soon, that cannot be quietly absorbed into the second household's day-to-day life. The danger with leaving everything to a surviving spouse and trusting them to pass a share on to your first family is not that they are dishonest — it is that life moves on. A survivor may remarry, may face their own costs, may simply come to see the money as the new family's. Nothing legally compels them to hand your first children the share you had in mind, once it is theirs.

This is what a trust is for. A life policy written in trust, naming your first children and the share they are to receive, pays them directly, outside your estate and outside the intestacy rules, without waiting on anybody's later decision. The money reaches the people you meant it to reach, in the amount you set, regardless of what happens to your second marriage afterwards. We set out how this works in practice in paying your first family without touching the estate, which is the cleanest way to give an older set of children certainty while still providing fully for a new baby.

The pension is a separate decision again

One asset that catches blended families out is the pension, because it does not follow your will at all. Most workplace and personal pensions pay a death benefit at the discretion of the scheme trustees, guided by the expression of wish or nomination form you last completed. If that form still names a first spouse, or names nobody, the trustees decide — and a form left unchanged after a divorce and a remarriage can send a substantial sum somewhere you would not choose.

Because the pension sits outside the estate, splitting it between two families is its own exercise, with its own tax treatment, separate from everything your will does. It is common for a second spouse and a first marriage's children to have competing expectations of a single pot, and for the paperwork to have settled the question years ago without anyone noticing. We work through that specific tangle in a second wife, a first marriage's children and one pension pot. The short version: check what your nomination form actually says, because it, and not your will, decides where the pension goes.

Scotland is different

If you live in Scotland, the framework changes in a way that matters a great deal to blended families. Scots law gives a surviving spouse or civil partner, and the children, fixed legal rights in the deceased's moveable estate — broadly, everything other than land and buildings — that cannot be defeated by a will. A child you might have hoped to leave out, or leave less to, has a legal entitlement to claim a share, and so does a spouse. That can pull an estate in directions an English-style will would not allow, and it makes deliberate planning more, not less, important where two families are involved.

We explain how those claims work, and how they can upset a plan built around a second family, in Scotland, where your children can claim against your estate. Marriage does not revoke a will in Scotland in the way it does south of the border, which is another reason the Scottish position needs to be checked on its own terms rather than assumed from English rules. The wider set of decisions a new family brings is gathered in our guide to life events that change who depends on you.

Frequently asked questions

How do I provide for children from two relationships?

Usually with separate arrangements rather than one shared pot. Older children may need a lump sum or a defined share fairly soon, while a young child needs an income for fifteen years or more. Two policies, or one policy split by a trust into defined shares, gives each side a known amount rather than a later argument that depends on a survivor's goodwill.

Do stepchildren inherit under the intestacy rules?

No. Intestacy passes an estate to a spouse or civil partner and to biological or legally adopted children. A stepchild you have not adopted has no automatic entitlement, however long you have raised them, unless you name them in a will or they bring a claim as someone you were maintaining. If you want a stepchild included, your will has to say so explicitly.

Will my older children lose out if I remarry?

They can. A new spouse takes priority under the intestacy rules, and marriage revokes an earlier will in England, Wales and Northern Ireland unless it was made in contemplation of that marriage. Adult children from a first marriage often receive far less than expected, which is why cover written in trust is used to keep their share separate and certain.