My husband has two sisters, one slightly older and one slightly younger. They don't live near eachother but speak a lot and share a hobby (as does one their husbands) and they meet up for that quite regularly. Their parents are elderly but they are lovely too and they see their folks a lot.
I am a very different person to my sisters in law but we all get along well and there hasn't been a cross word among us in just over 20 years of me being with their brother. My sils love my kids and treat them very kindly. Ultimately I am not super close to my sils, but I have absolutely no problem with my husband having a really good relationship with my sils. I love DH and want him to have as many people in his life who love him, support him, etc; same as for my kids.
My mother had a terrible upbringing which basically ended up with her fending for herself from when she was a teenager. Her parents are long dead and she has no relationship with her many siblings, as they are all very dysfunctional. She did her best to give me and my sibling a stable home with lots of happy memories but at times it has been clear that she didn't have a happy time growing up. I don't have a close relationship with my own sibling but we get on ok when we see eachother. I have lots of friends and am a real people person but just don't click with my sibling beyond pleasantries.
Ok, now the crux. My mother thinks that my husband's relationship with his sisters is weird and pulls a face any time I mention that they are meeting up or that we are going on holiday together. She has said that she thinks they're all obsessed with eachother and that it isn't normal. Now I don't tell her anything about my sisters in law except recently she asked something about one of them and I mentioned she had been staying with us a while back. Mum pulled the most horrible, disgusted kind of smirk and said 'AGAIN?' Then she pretended that she was trying to stifle her words but couldn't contain herself and said 'weeeeeeeeeirrrrrdddddd'.
My father's family is very close and my mum has behaved similarly towards him my whole life. He just completely ignored her when she said her piece through the years, and continued seeing his family. She doesn't respond to logic and you cannot reason with her about it. I feel like she always tried to make my dad feel like he was weird for being close to his family and is now doing the same to me. I know she wants me to feel embarrassed about how close my husband is to his family but I do not care!
I just ignore her or do grey rock when she starts but I feel like I don't want to tell her anything about our lives when she acts like this. How do I handle this?