Steve, well done with your D! My ex and I have been through similar with all 3 of our kids, and when they around the same age as your D. I really think it's a rebellion thing, the kids at some point start testing limits to see what they can get away with. The thing is, they WANT their parents to intervene and put some discipline in their lives. Sure they'll complain about what jerks their parents are being, but inside they know you're loving them and teaching them important life lessons. Our experience was that once the kids saw they couldn't cross certain lines in our house, then they never tried to cross them again. Both D's are grown now and incredibly focused, so it was just a phase. S15 is getting there, he's just emerging from his rebellious stage.