I don't personally have a story of children on bikes, but I was, and my sister and brothers were even younger than I. We rode horses, skidoos, and little mini bikes all over the 20 acre home place in Northern Saskatchewan where we grew up some. In a past HOG chapter, there was the King family. I think there were six kids. From diapers all the way up to about nine - this is now at least six years old - they rode with Mom and Dad. Dad had an ultra with side car, at least three littel ones could fit in there, one behind him, and one behind her and one at home. They still all ride, although now she has an ultra and a side car too. Where there is a will ...... there is always a way.