My father has aways had a bike and would take my sister and I on rides all over the place. First ride was on a Kawasaki H1 500, I was terrified, but also never the same! All 3 of my kids have taken rides around the neighborhood by age 3 and have accompanied me to every super bike race at Mid-Ohio from age 1 up. My oldest (14) rides a moped and is so hooked on bikes that it is all he talks about for years. My daughter (12) also wants to get moped and ride a bike once she is old enough. My youngest (10) rides motocross and started racing towards the end of last year. All of them have had dirtbikes starting with PW50's.
Motorcycles have become a common interest between my children and I, and our lives are better because of it.