What degree of obligation does a *Long-Term* Significant Other have to spend time with their S. O.'s family?

ChurchOfSteel

Backstory: Moved across the country (U. S.) to live closer to my girlfriend's sister, namely. I would have preferred to live elsewhere, but I was willing to try, just so she could be closer to family. I can't stand the woman. Even though she's astoundingly brilliant and very high intelligence and charisma, it's tinged with a lot of arrogance and demeaning comments. She is extremely rude, domineering, controlling, and belittles others constantly.

To me, she's just toxicity itself. But. My girlfriend is basically in love with her sister and will constantly defend her actions, even when they're creepy as hell, like trying to take secret pictures of me in a store (reason yet unknown) or just rude like giving and taking invitations to events away as a sort of controlling punishment when she doesn't like something or outright insulting or actively instilling doubt about my loyalty to my girlfriend by suggesting I'm not loyal.

Anyway. What obligation do you have with a long-term (for us 3 year) relationship to spend time with their family? Maybe I could do holidays or something, if it would be good for my relationship, but otherwise, I do not want to see this woman every weekend.

What degree of obligation does a *Long-Term* Significant Other have to spend time with their S. O.'s family?
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