Trust Funds for Children
One thing that's annoyed me in most Sims games is that when a sim finally ages into a young adult and moves out (no matter the family funds) they always start out with little cash. Especially in Sims ...
Forum Discussion
Glad to see a few fellow simmers agree. This is only a very small feature but sometimes the smaller features can be the most fun/impressive. Even adding a bank or loan shark which allowed you to borrow money and repay it back over weekly installments would go a long way. But as @Jen_Charlton said, just the simple option of being able to spit household funds when a sim moves out would be a great addition
