I just realized a neat/potential use case for wallets/seeds/keys

A seed can be used to create an extended public key (hd) with different derivation paths, and the parent seed has access/control over all derived keys. Each of the derived private/public key pairs could be given to different people/children and they would have control over their own derived keys/wallet while still allowing the parent to manage/access/recover any of them

Not sure if this would be useful, just food for thought (or did I realize something that already uses this?)