Honestly it sounds like the boys are having a hard time coping, and why not? Their mother is not there, they got moved to a new house with a new woman, and a new brother figure. They just need you to be as understanding as possible. How old are they? Try to do things that involve everyone, then also make time to spend with just them. I think it will help them cope and possibly be more apt to open up and tell you how they feel. Good Luck with your boys I'm sure it will straighten out