Woule he exhibit this behavior at our house because of something going on at his mom's house, or would it be because of something at our house only? As far as I can tell, he doesn't have any issues with us.
Also, since he is only here every other weekend, can we really make a difference in this behavior? Doesn't it need to be consistent, especially at his primary place of residence? If that is the case, then I'm not sure what we can do. As I said before, we get no support from the BM on these issues. All we get is denial that they exist. Very frustrating.