If given the address for your great great-grandkids shared wallet – how much more than 1 satoshi (0.00000001 BTC) would you consider fair to save for them?

I do not understand the urge to save for the grand kids and stuff.
First make sure we uplift our lives, make sure our family wife kids parents are having good standard if living, then the last priority is for grandkids and stuff.
Correct me if im wrong.

Let’s say btc goes up 1000x every generation. How much money you want to give them ?