A family tree in Legacy OS is not genealogy theatre. It helps map who belongs in which conversations, who might need instructions, and how guardians relate to the people you name in your circle.
Trustee context means the product can reflect structure: who is responsible for what, not only “here is a pile of files.” That reduces ambiguity when time is short.
Keep it accurate enough
You do not need every cousin on every branch. You need enough clarity that nobody has to reconstruct your intent from DMs and memory.