1. drop activities he has no interest at all.
2. let some activities he might like on his own. do not check what he has done
3. find a way to show him what he learned is helpful to others. For example, help others using what he learned
4. learn together with him, like playing a chess or board game. Kick away his grand parents. If you know how to play instruments, have a family concert. If he is alone on instruments, just let it go.
5. watch baseball games or football game on a regular basis to provoke his boy's spirit
6. work together on hard problem with him. Whatever he did is his work, do not make it perfect.
7. have fun party with the same age boys.
8. join cub scout