Theoretically Ideal would mean:
1) The parent has both the legal right and the technological means to impound 100% of the child’s income stream. “Legal right”, in this context, means only that a signed contract exists between the two parties. I’m not suggesting that any new laws need to be passed.
2) Some small portion of the child’s income stream would be sent to the family’s General Fund, to pay for things like the mortgage payment, utilities, and groceries. Assuming that the family’s finances are not under stress or duress, this might be 5-8% of the child’s income. If the family is in some kind of bad financial straits, this amount could go much higher.
3) The bulk of the child’s income would be placed in a savings/brokerage account, to be given to them when they eventually move out.
4) Child would receive a fixed allowance via a restricted debit card, with very fine-grained limitations of what the card can an can’t be used for.
Cash is definitely the enemy here. If Junior is employed as a waiter, bartender, pizza delivery driver etc. , that would mean they are bringing home a large part of their income in cash every night, and that would tend to make an agreement of the type I have outlined above unenforceable.
Renita Cryptocurrency is an answer.
I was trying to imagine that we were living in a slightly better world. What if there were nothing but digital currency, “smart” debit/credit cards, and Apple Pay?