Dylan and ungrasped concepts

Poor Dylan, it has to be hard to be in the middle, kidwise. He and Abby will play on the floor and lay and roll and fall on each other and its "a fun game". But Dylan does not understand why he can't do these things with Lacey. He just doesn't get that playing with her is not like playing with Abby. It is quite comical to all of a sudden hear Lacey screaming for help and to look and see Dylan laying across her looking at you like "what?" He keeps expecting Lacey to wiggle out or play with him and doesn't undeerstand that at least for alittle while thats not going to happen!!! Poor little guy!