I am a seperated parent of a 13 yr old daughter who is a true "monster". She is rude, obnoxious, nasty and whenever I ask her to do her chores or clean her room I get nothing but "WHATEVER" and then the door slams in my face. I understand from many people that I have talked to that this is normal behavior for a teenager but I am at my wits end on trying to make peace in my house. I also have an 9 year old son who gets to witness this behavior and then tries to mimick it as well. I need some advise - what do I do to keep the peace"?