When you have kids, there are a lot of strategy involved.
If I have kids and they are old enough to get a job, I'm starting to collect their rent but I will take that money and secretly put it into an investment portfolio for them. Once they get married, I will surprise them and will transfer "their" money back to them so they can have a good start in their life and starting their own family.
It is going to be my biggest kept secret yet.