Our boyz (ages 6 and 10) have been riding with us since we got our first scoot 2 years ago. They love it.
We are very careful about it though. Helmets are a must for everybody. As are long pants and sturdy shoes. I've gotten both the boyz armoured jackets. I just found some really small womens sizes and they work great and look alot better than alien looking, motocross jackets that are made for youth.
Dh has a topcase on his Fly and I have the chrome rear rack/backrest combo so I don't have a fear of them falling off the back.
Then I also got two of these belt like things from
www.denniskirk.com.
The driver wears them around their waist and it has handles on it the rider can hang on to.
We stick to small, simple rides near home, around the lakes and parkways or something. We don't go maybe more than 20 minutes without taking a rest stop.