Sjs:
“Now, not everything has an answer but if you instill in your children a love of Torah, then the few laws you cannot explain are will be ok with them because they will believe and understand the premise.”
Exactly, hopefully that will keep them connected but even if a child has a very strong solid background, often they will just try some of the garbage out there and get hooked.
I don’t think there is a clear cut answer, it depends on the kid and Hashem should send all their parents koach to continue