What a brilliant way to have smaller amount of funds available for the family. While it restricts any one person from spending, it does allow any 2 people to spend. Kind of a checks and balance so no one person can spend it all without at least one other person of the group knowing about it. Normally a multisig requires the first spender to send the transaction to a second spender in order for it to be fully approved before broadcasting the transaction. Just thinking about how to test this without putting too many sats at risk. Perhaps setup a 2 of 4 wallet in Bluewallet. Then have 2 phones with the wallet setup, each with a different approval key. Then try to send a small amount to a different wallet as follows: Phone 1 creates a transaction. Phone 1 sends the transaction to phone 2. Phone 2 approves the transaction. Phone 2 broadcasts the transaction to the network. Payment done.

Happy Bitcoining :)