Those who know both sides agree that my ILs go out of their way to make ILs unhappy.
I used to take several desserts over to her house for every holiday. I love to cook and I love to bake. No one ever ate any of the desserts that I made. Then, enter SIL, who is my BIL's second wife (MIL and SILs were successful in breaking up their marriage.) I love this woman like she was my sister. I helped this BIL get through his divorce. We are still close to them. She used to bring food, too. No one, but she and I would eat it.
After years of me bringing food and her bringing food, we stopped. Why take it if no one appreciates it?
I got along splendidly with MIL up until the day we got married. That day, she walked around like a sad sack. She never gave us so much as a card for our wedding. We really didn't care about a gift, but a card to save would have been nice.
That's when she got to be demanding. Even though my DH hadn't lived with her before we got married, she never pressured him to be at her house all the time. After we got married, she expected that he would be around her house, unless he was sleeping. When he wasn't there, she'd be calling our house all the time.
She had 3 of her 4 other kids living at home. DH is the oldest of 5. It wasn't like her last child was leaving the nest. She has convinced her two DDs that they should sleep at her house more often than they do at their own houses... where their DHs are sleeping.
My assessment of MIL is that she is narcassistic and very munchausen's. She loves to go where there is suffering. She hates to be around those who are happy. She creates drama in her life and her kids run to her side.
My FIL died last October. She insisted that there be no wake or funeral for him. They divorced almost 20 years ago and she has spent that time making sure that none of her children ever would see him. My DH still hasn't told her that he helped his father by moving his things out of his apartment when he went to a personal care home. Nor can he tell her that he helped his father with some financial things towards the end. He would be scolded for this and made to feel guilty for going against her wishes. Her powers over her children are very strong. She wants dependents. She doesn't want free thinking children.
As for his siblings.... they use my DH when they need him and don't want to know him when things are going well for them. Things are very strained when we're with them because we have very little in common with any of them, except the one BIL & SIL I mentioned before.
Yes, it seems perfectly clear to me that we shouldn't be with them on holidays. But, I'm not going to make my DH choose between them and us. I'm not one for ultimatums. I just wish that when we are with them that he'd do more sticking up for me.