This is similar to my situation. I have known my SS since he was 5. He is now 10 1/2. Your rules are the same as mine. It irritates me the most when my SS mouth starts going. Lately he is opposistional. This child has been shown by example how to do his chores, table manners, share, etc, etc, etc for 5 1/2 years. To this day what is shown and taught at his BM house is what shines through. And it is similar to your story. Like you and your situation, this is sad and frustrating. All I can say is that you need to stick to your guns NOW. At the age of 8 you can still get her in line. As far as spanking, I have a 4 year that gets spanked. My DH has spanked my SS. To this day I have resisted the strong urge to spank my SS. I don't because: he is not my son, no matter how much I love him and put him first. Now that he is older I hand out more chores, usually in what ever part of the house or yard needs cleaned up most. When he is doing poor in math or spelling and SS gives me hard time, suddenly it is time to practice division. When SS was 8 he hated to write. I gave him a topic and he had to write. Started out with one paragraph and worked up to 5. (I liked that best) Even when upset with SS I gave something fun to write about; Best friend, day at beach, birthday party, what he LIKES about our house AND his BM house (nothing about what SS dislikes, we already know). My advice, and I am working on this hard myself, remain calm infront of the kids. Turn your back and count to 10. Find something to do with each child for 1 hour a week alone. There are times when I have to take two steps back with SS. I also posted 4 rules for each room of house and it actually worked. Bathroom: brush teeth, hang towels, put all bath supplies back in proper place. Kitchen: help set table, help clear table, play with little brother while I cook, help cook when asked. Bedroom: make bed, put pajamas away, put dirty clothes in hamper, pick up toys, vaccuum. I know this is getting long, I relate so much. All of this has helped at one time or other over the last 3 years. Every year or so I have to put a new twist on things. For some reason no matter how much things are consistant here there is always havac. So GOOD LUCK! My thoughts are with you.