My 15 year old step son is deliberately mean to me. It doesn't matter what I do, he is disrespectfull. It is usually only when his dad is not around, but the other night his dad saw it first hand, and during the "fight" disucussion, the stepson said that he couldn't wait to see his mom because they laugh all the way to school about me. Now I know for a fact, this is true, because his younger sister said it was and she hasn't entered the lie to us stage yet. Do I address this issue with her, how can he respect me if his mom has no respect for me.