Jealousy?

ZQ knows how to do this even months ago. When one of carry him and the other put our hand on the other's shoulder, ZQ will push the hand away. He seemed to be jealous. We used to think wah, he so young oredi know ... such is human nature. But recently, I decided that it's time to "educate" him and tell him that this is incorrect. Else in future if he is going to have a younger sibling, how would he treat the sibling?

Children are to be taught and taught properly.