1. A "vault" wallet should not be "shared". Yes, you could create an "intermediary" cache wallet where everybody could have access, but not with all your funds. Your HODL savings should not be shared, not even in multisig or with family.
  2. If you really want your family to see that "vault" wallet you better give them access only with a "watch-only" solution (many mobile wallet apps support to import a xpub) and they can have direct access to check balance and also generate new addresses to make new deposits. NOT moving funds from it!
  3. Use the "three levels stash" method for all your BTC wallets.
  1. Each member is better to have its own vault, cache and spending wallets.
Never trust human stupidity / ignorance / lack of knowledge. Shit can happen all the time, even with advanced users.
I did not say that I was going to dump my entire savings into this. I do not want a watch only solution, none of this addresses what I am trying to accomplish.
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