I spent yesterday afternoon fixing a Trail-gator to mine and Sam's bikes. It's a device that allows an adult to tow a child's bike, but the connection can easily and quickly be unhooked. For example the adult can tow the child's bike to school and then cycle home unhindered. Or the adult and child can set out on a ride together, but the adult can tow the child when he becomes tired.
I need to build up my own cycling skill before I'll feel confident doing this on proper trips, but getting it fixed up already gives me the impetus I need to actually get my a**e in gear and get cycling.