I'm asking for family finance intentionally, as opposed to personal finance.
Here's my use case. I have two small children, and I have opened (virtual) accounts for both of them. What I do is I set aside a certain amount of money for each, and I try to invest it as well - it will all be theirs when they turn 18.
Now, I could just open actual separate accounts, and invest them separately, but if I invest my money and theirs, this is potentially a 3x overhead as well as (up to) 3x the fees.
I want to do keep all the money in one account, but I want good software that would help me keep track of how much of it belongs to my children.
The software must be available on Mac OS (a web-app would be an option as well. I would almost prefer a web-app). I'm open to all options price-wise.