Choose a Person, Not a Hope
'Someone in the family would take him' is not a plan; a named person who has actually agreed is. Pick someone who understands what a tortoise is: an animal that may need care for decades, with an outdoor or large indoor setup, a specific diet and vet costs that arrive without warning. Ask them directly, while you can hear the answer, and take a hesitant yes as a no — a tortoise handed to a reluctant keeper is a tortoise quietly looking for its next home. Name a backup person too, because your first choice's circumstances can change as surely as yours.
Write the Arrangement Down
Record the essentials where they will be found: the chosen keeper's full name and contact details, the backup's details, and a line making clear they have agreed. Keep it with the tortoise's own paperwork — vet records, species documents, purchase details — and tell your family the note exists and where it lives. Mention the arrangement when you make or update a will, since a tortoise is property in the eyes of the law in most places and a written intention carries far more weight than a family understanding. A copy held by the chosen keeper themselves is the copy most likely to surface when it is needed.
The Care Summary That Goes With the Tortoise
Your successor should not have to reverse-engineer a lifetime of routine. Write the working summary: what the tortoise eats and what it must never be fed, how its housing runs across the seasons, whether it brumates and how that is managed, its bathing and exercise habits, its vet's details and its medical history. Include the quirks — the foods it refuses, the handling it dislikes — because those are the details that took you years to learn and minutes to write down.
Keep It Current
A plan like this decays quietly: the named keeper moves away, the vet changes, the backup's phone number is replaced. Review the note whenever anything it mentions changes — a new vet, a new backup, a changed phone number — and re-confirm with your chosen keeper every so often that they are still willing. The few minutes that takes are the whole difference between a plan and a piece of paper.
So They Can Step In on Day One
The smoother the handover, the less the tortoise notices the hardest week of its life. A relative you select can receive profile access under KinsLe Family Sharing.