M.C.
I wouldn't focus the blame on anyone actually; change is difficult for anyone, especially children. He may be feeling left out, you said you have 2 other children, kids get frustrated which turns into behavioral change, emmotional/mentally and sometimes physically. Your son may feel left out as I mentioned before from your new husband, his new stepfather. His sisters may be experiencing the same emotions which in turn results in behavioral changes (rage, talking back, refusing to do chores) my daughter is 4 and lately has bn acting out or not listening, she blames it on her father which is deceased, she nvr had the chance to meet him, he died in a car wreck when I was 5 months pg w/her. I hate it everyday she won't ever kw her daddy, I kw it upsets her and sometimes makes her mad. She's started hitting me and yelling only bc she didn't kw what else to do bc her frustration was so great, that was the only thing she knew to do. Maybe your son has all his frustration built up inside bc of his "loss", most kids of divorced parents go thorough various stages; mood changes, acting out for no reason, talking back, etc..maybe try taking a day just for you & your son, just the 2 of you, let him decide your day, afterall, he is the "man" of the house now! Let him talk & you listen, kids will tell you everything if we just listen..good luck!!