Thanks, Apognophos!
There's no substitute for it. You can either [even?] put the working effort in, give 'em the best opportunities -- you know when you do all of that, they have to make the truth their own.
This leaves no room for doubt: if your child does not "make the truth his own" it is because you, the parent, did not put in enough effort.
(I remember growing up with this same teaching and feeling so bad that my parents were going to blame themselves when I eventually left.)
ETA: never mind...see a few posts below...
the two youngest boys didn't do as much in the truth, they're not even involved serving in the congregation.
So the youngest kids are still IN the "truth" but this dad has to carry around a ton of guilt anyway because they are not in the "truth" enough? Is being a publisher in good standing no longer enough to be considered 'good'?