I mean when they are young kids...it's not like I took CDs and put them on when I was 5 years old, my parents put on music for us to listen to.
At that age I'd probably be playing kids stuff for them like Disney artists and shit or just top 40 bubblegum pop. At that age all you want is simple beats, clean vocals, simple lyrics, and catchy hooks/choruses. By the time they're old enough to want something better than that they'll be old enough to find there old music. Yeah I'll probably suggest some of my favorites and things I consider you he classics when their a little older and hope that maybe it does for them what​ it did for me, but I'm not gonna put stuff on that I like and make them listen to it.
Yes, when they reach a certain age they make their own decisions. The stuff you put on when they are young does have an influence on their music taste though, at least I know it did for me. ---