My StepDad rode a Honda Dream 305 in the 60s, but he never had a bike while I was growing up until he gave me a little XR75 when I turned 11. He bought himself a Trail70 to putt around the woods on. We had a blast camping, riding, and hunting together when we had those little bikes. A few years later he gave up riding and sold off both bikes to upgrade me to a CR125 that I got into all kinds of trouble on. He never did ride again and died young back in '99, but thanks to him winning the battles against my Mom's wishes, I got a fairly early start on my motorcycle fetish and continued to pursue my love of it ever since.
My Father has ridden his whole life, and took me for rides when I was a teen and visited him in Florida. Since he's moved back to Ohio a few years ago, we've taken a couple short rides together, but no long days now that he's retired and has bad shoulders. Anymore his saddle time is mostly straight to a local destination and back on his triked Wing. So if it weren't for my StepDad's gifted dirtbikes, and my Father's biker dna....I'd probably be one of those "car guys".
I tried influencing my daughter to get into motorcycles when she was young, but she never really took interest in it. She did enjoy a few rides around the neighborhood when she was 4 or 5 on the back of my YZF and her grandpa's Wing though. I'm a believer in raising kids on/around bikes so they can make up their own minds whether they like 'em or not, but in my opinion if they never get the opportunity to try it - you're doing wrong by the kid.