The short answer
There is no name that answers this question. Parents ask it hoping for a person — a sibling, an aunt, a trusted friend who will simply take over — and the search for that person is usually where planning stalls, because no one candidate can carry everything a parent carries.
What actually answers the question is a set of arrangements. A parent does at least eight separate jobs: knowing what to do in the first hour of a crisis, being the person who steps in, holding the knowledge of how the day runs, holding the medical picture, deciding where your child lives, holding legal authority to decide on their behalf, funding the care, and knowing where every document is kept. When a parent is gone, those eight jobs do not transfer together. They land on different people, at different times, in whatever state the parent left them.
That is genuinely better news than it sounds. A single successor is a decision most families cannot make and so keep postponing. Eight arrangements are eight smaller problems, and several can be completed in an afternoon. A family that has written down the morning routine and the medication list has already moved a real part of this out of one person's head — whatever remains undecided about the rest.
Most families do not work through these in order. They start with whichever one keeps them awake.
The eight arrangements, and what each one answers
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If something happens to me suddenly
The first hours are decided entirely by what other people already know. Nobody will have time to be told. An emergency card puts the essentials — conditions, medication, who to call, what frightens your child — somewhere a stranger can read them.
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Who steps in
Someone has to actually arrive. That means a named person who has been asked and has agreed, plus at least one fallback, because the obvious candidate is often unavailable on the day it matters.
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How they will understand my child
The routine, the preferences, the things that calm and the things that escalate — most of it exists only in a parent's head. Written down, it is the difference between care that continues and care that restarts from nothing.
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What they need to know medically
Diagnoses, medication and doses, allergies, treating clinicians, what a bad day looks like. A caregiver who cannot answer a doctor's questions loses time your child may not have.
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Where my child will live
Staying at home, living with family, supported living, a residential facility — each has different requirements and different lead times, and several cannot be arranged quickly when the need is sudden.
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Who has legal authority to decide
Adulthood changes this even when capacity does not. Without guardianship or the equivalent, a parent's successor may have no standing to consent to treatment, manage money or make decisions at all.
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How the care will be funded
Care continues after earning stops. The gap between what lifetime care will cost and what is currently provided for is the number most families have never actually looked at.
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Where everything is kept
A plan nobody can find is not a plan. Policies, certificates, bank details, the Will — a register of what exists and who holds a copy is what makes the other seven arrangements usable.
What parents often miss
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Assuming, rather than asking
A sister who would obviously step in has frequently never been asked directly, and does not know she is the plan. The conversation is harder to imagine than to have, and it is the single highest-value hour in this whole list.
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One name, no fallback
Successors age, move, fall ill and sometimes predecease. A plan with exactly one named person is a plan with a single point of failure, and it fails silently — nobody discovers the gap until the day it is needed.
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Planning only for death
The more likely disruption is not death but a period of incapacity — a hospital admission, a stroke, a long illness. In that situation you are alive but unable to instruct anyone, which is precisely when written arrangements matter most.
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Leaving money without leaving authority
Funds that reach a child who cannot manage them, with nobody holding legal standing to manage them on their behalf, can be worse than no provision at all. Finance and legal have to be solved together.
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Writing it once and never revisiting
Medication changes, people move, a facility closes, a diagnosis is updated. A five-year-old document read in an emergency can send someone confidently in the wrong direction.
What this looks like in practice
A mother raising a nineteen-year-old with cerebral palsy has assumed for years that her younger brother would take over. He lives four hours away and has never been told.
She does not solve the whole question. She spends one evening writing down the morning routine, the medication list and the two numbers that matter, and downloads it. The following weekend she calls her brother and asks him directly — he says yes to being the person who comes, and no to being the person her daughter lives with, which is information she did not have before and could not have guessed.
Three arrangements have now changed state: someone knows what to do, someone has agreed to come, and where her daughter will live is now an open question being worked on rather than an assumption quietly failing. Legal authority and funding are still untouched. That is still a materially better position than the one she was in a fortnight earlier.
Where to start
If you do not know which of the eight to begin with, the readiness check is built for exactly that. Thirty-one questions, no account, and it ends with a short ordered list of what to do first — based on where your family actually stands rather than where a checklist assumes it does.
Nothing you answer is saved. Download the report if you want to keep it.
Related planning areas
Important
LegacyNest is a planning tool, not a law firm, medical practice or financial adviser. This page is general information about how families approach continuity planning. It is not advice about your family, and nothing here creates a professional relationship. Decisions with legal or financial consequences should be taken with a qualified professional who knows your circumstances.