How do you tell your children what they already know 10, 20 or 30 years from now but they act as if they know it now?

I am stuck in a Kurt Vonnegut novel. Something about how I am experiencing time.

Do adolescents have the capacity to listen? I have been one, have had one and currently am having another.

What were my mother and father like when they were adolescents? Did they listen to and respect their parents?

This is not exactly the same video as before