My 16mo DS is constantly pulling my 32mo DD's hair. He often resorts to it during an altercation and he is losing! But they can also just be playing nicely together and he'll suddenly grab a handful of her hair and pull until I physically intervene and stop him. Usually he comes away with a tuft of hair in his hand. DD is obviously not impressed by this!! Any suggestions on how to discourage DS?? Before I start pulling my own hair out!!