Anyway, just because someone's daddy is rich means they invest it all in their sons, most Dads that got rich didn't get rich by blindly throwing away money.
Plus they need to see the talent also first. I think Stroll might have been pushed the most by his dad's finances as it paid for some great advantages in the team.
The details of how far that has gone will probably only be revealed once the teammates retire from racing or are comfortable enough settled in their careers.
For Newey I read that the biggest way he tried to support his son is by offering some assistance to the teams, dunno how much is possible but I find it not unreasonable
that RedBull in order to keep Newey happy and loyal to allow him to invest some time and energy in his sons career that way. Giving his son some extra benefits to beat his rivals.
(In addition Newey owns his own F1 car in theory he could give his son close to unlimited testing mileage.
With regards to the Schumachers I am sure their income is sufficient that combined with their insurance they can easily fund for the care of Michael and still spend a lot on their son.
But his name attracts sponsors on his own, and they seem to be taking a sensible path for him. He is not a super star driver like Max Verstappen, so he needs to different path and they pay for spots that help him improve steadily instead of pushing him into the deep where he would drown.
Some made it sound as if Verstappen had huge cash behind him also, but he mostly had a good crew behind him who focussed solely on him. He got into F1 relatively cheap as his talent combined with his dad as his engineer in karting helped him to factory contracts.