I dont even have kids so I am not really saving anything for them I am saving my bitcoins for myself.
I'm single too, but the thing is, i would probably keep saving bitcoins until i'm earning them and until i'm involved with the community and that might go on until i have kids or it might get finishes before that, who knows.
Without thinking of future we should continue to collect it and save it for future and if our kids are fortunate then they can take advantage of it in future if bitcoin still survives by that point of time.