DEAR MISS MANNERS: I have a widowed longtime friend who is like a family member to me. He attends all our holiday meals. However, his partner of several years has become a problem.

She became aggressive at our daughter’s engagement party, arguing with my best friend over politics. She wouldn’t back down when asked to change the subject. She even demanded that my friend leave my house, which of course I would not allow.

This Thanksgiving, we were at the home of my son’s in-laws, who graciously included my friend and his partner. The partner was on notice that this group did not like to talk politics and had different beliefs than hers. Even so, she again started talking about uncomfortable subjects, and I was asked to intervene.

She is getting a reputation for being difficult. I already

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