Why are wives always to be blamed

My husband and his brother don’t get along , for about 5 years now. It’s an on and off relationship. When he needs anything he calls my husband for help and he never ever says thanks for it or I appreciate it. And on top of that he wants him to work for him and not pay him. Okay whatever. His mother thinks its my fault that he doesn’t want to work for him or help him out. How is it my fault? He calls my husband stupid , dumb , and etc and it pisses him off and myself. We are having our first child and i don’t like the way they treat him. My husband is a person to say no , I’ll help, any-day or any time. I am 39 weeks pregnant and tomorrow I have a doctors appointment at the hospital and doctors check up. He wants to take me because I can’t go alone, he is worried. My crazy mother in law doesn’t care what he has to do but he must go to work with his brother. My husband said it’s my first child I have to be present for my wife and my kid. She doesn’t care about it ... I don’t come first because I’m not “blood related” what she tells him. It hurts me a lot, I am a little stressed out , I’m a week away from my due date. And she absolutely don’t give a dam about me or my child. She treats her kids like they are 5 and 6 when they are 35 and 36. If something is going wrong ... she calls me and tells me he can’t be there for you always , we are his family and that’s his brother. Okay?? I’ve been pregnant for 9 months now .... what have she done for me ? NOTHING, not once called to say how I am doing... or what I am up to. Tell me if I am wrong, I don’t want her to be present in my daughters life. She’s very rude and self centered person and every little thing she says hurts me more and more. My husband doesn’t like it and hangs up the phone.

On the other hand, my mother is the best. I am so lucky. Today she sends my brother out .. a two hour drive and she cooked so much for my husband and I ... it’s the holidays and my birthday in few days and she doesn’t want me to do much work. I love her so much and miss her.

My mother invited us over today and I explained I can’t come because it’s a long drive. She understood , my mother in law invites us to, so I explained I can’t make it .. it’s hard . She tells me “ we were all pregnant at some point” she called my mom to see if I wasn’t lying about staying home. I HATE THAT she doesn’t trust me. And calls my mom . I hate her and i never hated someone so much!