I'm not married and I don't have kids so I too have not had the privelege, nay, I say
DUTY of exposing my kids to prog.
However, I have thoroughly indoctrinated the drummer in the high school ministry worship team (he's 15) with Rush, Yes, Kansas and all the greats. He discovered Dream Theater on his own and that's his favorite, but hey, nobody's perfect.
I also had an amusing car ride earlier this year taking some kids on a Boy Scout camping trip...
ME: Do you like Echolyn?
KID: Never heard them.
ME: Well, I'll tell you what - we'll just play the first song and if you're not into it, we'll put in something else.
KID: Sure.
Of course, the song was Mei and it's 50 minutes long.
The kids were intrigued if not impressed...