In laws

If my mom didn't give a damn about my son I wouldn't give a damn about her either. How do I get my husband to stop feeling guilty because his mom decided to turn her back on him and blame it on me saying I'm the one that leaves him motherless? She didn't like me from day one. She didn't buy anything from her grandson's baby registry. There was this one time when my son was about a couple weeks old she came to the house and told my husband to drive her to the mall with her friend and my husband didn't come back until late in the night. He came back with an outfit for our son and told me he was gonna buy it but since he took them shopping and they were already paying for stuff I guess his mom decided to pay for the outfit for my son. She never did anything else for my son he didn't even know her. She only came to the house about two times to drop stuff off then left and spent no time with her grandson. She has had no contact with my husband for over a year now. My husband's brother doesn't know our son either he never asked to meet him or to visit but they sent birthday invites for my husband to come to their son party and made it clear he should come alone or bring the baby with him. I laughed so loud they didn't have to single that out cause I didn't want to go anyway around people who don't like me and my son not going. My husband decided not to go they don't show any interest in getting to know our son but wants him to come to their son's party. His mom is mad and went no contact with my husband because I compared my situation to someone else on a post on FB and all her families and friends saw the comment. It's more of an ego thing. If you don't want people seeing hearing that you're not being a grandmother then why didn't you step up and be a better one.