Mother in laws

My mother in law is CRAZY! We have not told her yet that we are expecting (not very far along) but we need too and I'm worried about how she is going to react! My family was very happy and supportive but his mother and grandmother do not and have never liked me (I'm not good enough for him and all that jazz) so I'm just afraid she is going to be negative. Also, she has said before that when we have children she wants to me called "glama"...I'm sorry but that is not happening? Any of you other mom/moms to be having or have had trouble with your spouses family?