Just one thing Terminator, a bike is not a toy

I know I love riding with my son, he is having a hard time learning to ride on his own.. progressing slowly he is just so afraid of falling. When I take him to a field by our house he does fine, but on the road/sidewalk he gets to nervous.. But I got a tag-a-long type bike that attaches to mine so we go for a ride atleast once a week, my work schedule prohibits doing it much more often at the moment.