We have tried everything with our daughter who is just about 2.5. She doesn't listen, talks back, and just completely doesn't care about anything we do to discipline her. We have tried taking toys, popping her butt, time out, no treats, everything. It just doesn't seem to phase her. We can ask her to do something as simple as sit down and she just tells us no. Nap and bed time takes about 2 hours to get her to do. She just comes out of her room like every 20 minutes...we put her back in and she screams forever. I don't consider myself a bad parent, but I feel like I am failing because she just doesn't listen and she's disrespectful. She slaps me and her father, bites us, tries to sit on her 9 month old sister. She knows how to talk and communicate, that isn't even the problem. We give our kids equal attention, but still nothing works, her and her sister are sharing a room for now and she climbs in the crib and takes the mobile apart and takes the teething rings and hides them. I just don't know what we can do anymore, any advice would be greatly appreciated.