The two Latin words most people sign without reading
Somewhere in almost every will there is a sentence that sounds like boilerplate. I leave the residue of my estate to my children, in equal shares, per stirpes. The eye slides right over it. It looks like the kind of legal seasoning lawyers sprinkle on a document to make it feel official.
It is not seasoning. Those two words — per stirpes, or their quieter cousin per capita — decide what happens to a person's share of your estate if that person dies before you do. And because we rarely die in the order we expect, this is not a hypothetical. A daughter is killed in a car accident two years before her mother. A son with three young children dies of cancer at forty-four. When the parent's will is finally read, one branch of the family is already gone. What happens to their portion?
The answer is not fairness, or intention, or what everyone assumed. The answer is whichever Latin phrase got signed.
What per stirpes actually does
Per stirpes is Latin for "by the branch," and the metaphor is the whole idea. Picture your estate as a tree. Each of your children is a branch. If a branch is still alive when you die, it takes its share. If a branch has broken off — a child who died before you — that branch's share does not disappear and it does not get handed to your other children. It flows down the broken branch to that child's own descendants.
Here is the concrete version. Say you have three children — Ana, Ben, and Carla — and you leave your estate to them equally, per stirpes. Each is entitled to one-third. Now suppose Ben dies before you, leaving two children of his own. Under per stirpes, Ana still takes her third and Carla still takes her third. Ben's third does not vanish and it does not get split between his sisters. It drops down his branch and is divided between his two children — one-sixth each.
Ben's kids inherit in his place. They step into the exact spot on the tree he would have occupied. This is why per stirpes is sometimes called "by right of representation": the grandchildren represent the parent who is gone.
What per capita does instead
Per capita means "by the head," and it counts people, not branches. There are a few variations, but the version most people mean divides the estate equally among the living individuals at a chosen level of the family — and, in its strictest form, does not send a deceased person's share down to their children at all.
Run the same family. Estate to your children, per capita. Ben has died. A pure per capita reading among your children counts only the heads still standing — Ana and Carla — and splits everything between them. Each takes one-half. Ben's two children receive nothing, because per capita counts living heads at that level and Ben is no longer one of them. His branch is simply not part of the arithmetic.
Same family, same tragedy, same estate. One word routes a full third of your money to your grandchildren. The other routes it to their aunts and leaves the grandchildren out entirely.
Why this is not a technicality
Stop and feel the size of that gap. In the example above, the difference between per stirpes and per capita is the difference between two grieving children inheriting a sixth of their grandparent's estate each — and inheriting nothing while the money goes to relatives who are already comfortable.
Most parents, asked directly, would say they want the grandchildren covered. If my child dies, of course their share should go to their kids — that is my child's family, my child's line. That instinct is exactly what per stirpes encodes. Yet plenty of wills say per capita, or say nothing clear at all, and the drafting choice silently overrides the instinct nobody ever spoke aloud.
The cruelty is in the timing. This clause only matters after two deaths, when the family is at its most raw and least able to absorb a surprise. Nobody is going to reopen the conversation with you. The document speaks, and the document is final.
The variations that trip people up
It would be tidy if there were only two options, but the law added a middle path, and the names blur together.
There is a "per capita at each generation" approach that many states now use as their default. It tries to honor a rough fairness: everyone in the same generation should end up with the same amount. Rather than each broken branch passing strictly to its own children, the shares of all deceased members at one level are pooled and then divided equally among the representatives in the next generation. In some family shapes this produces the same result as per stirpes. In others — particularly when more than one of your children has died and they left different numbers of grandchildren — it does not. One method can leave your grandchildren with unequal amounts because their parents had different family sizes; the other equalizes across cousins.
You do not need to memorize the arithmetic of every variation. You need to know that "just split it fairly" is not a single, obvious rule — the law has at least three defensible answers, and they pay out differently. If your document is silent, your state picks one for you, and its pick may not be yours.
How to get this right in an afternoon
You do not need a law degree to make this decision well. You need to look at your own family tree and answer one question at each branch: if this person dies before me, where do I want their share to go — to their children, or spread among my other heirs?
Start by naming your beneficiaries and, next to each, writing what should happen if they predecease you. Do not leave it to a default word you don't understand. If you want a child's share to pass to that child's kids, say per stirpes and, ideally, say it in plain language too: if any child of mine does not survive me, that child's share shall pass to their descendants. Redundancy between the Latin and the English is a feature — it removes the argument.
Watch the edge cases that break the neat picture. A child with no children of their own: where does their share go if they die first? A blended family where "descendants" might or might not include stepchildren you never formally adopted — the law usually does not, so if you mean to include them, you must name them. A beneficiary who is not a relative at all, where per stirpes barely applies. Each of these deserves its own sentence, not a single Latin phrase stretched to cover situations it was never built for.
And remember that this same choice hides inside your beneficiary designations — the retirement account, the life insurance policy — not just your will. Those forms often offer a per stirpes checkbox that people tick or skip at random. A stale or blank designation can undo the careful language in your will, because the account pays out on its own terms.
The honest goal is a plan that survives your assumptions
Estate planning quietly assumes you will die first, oldest to youngest, in order. Life does not read the plan. The whole point of thinking about per stirpes versus per capita is to build a document that still does the right thing when the order breaks — when the person you expected to outlive you doesn't.
That is where a tool like Heirloom earns its place. It walks your estate branch by branch and asks the predecease question out loud for each heir — the question most wills bury in one unread Latin word — so you can see, in plain terms, exactly where a share would land if a branch broke. It won't write your will for you or replace your attorney. It just makes sure that the two most consequential words in your plan are ones you actually chose, and understood, before you signed. If you've been meaning to look closely at what your own document really says, that's a good afternoon's work — and a quiet gift to the people who will read it when you can't explain it anymore.