I am trying to determine age-appropriate behavioral expectations for a 4.5 year old. He is obedient and does small chores. He knows there are behaviors completely unacceptable (hitting, throwing hard toys). However, I would like opinions and strategies for interrupting, being annoying and quarreling with an almost 2 year old sister. He forgets not to interrupt but stops when reminded. He will stop doing an annoying behavior when directly told and then start a different annoying behavior. And the 2 year old is annoying but how should that be handled?