DEAR ANNIE: I am caught in a very difficult family situation. I have twin sisters-in-law, Tricia and Tanya, who have not spoken to each other in more than 25 years. To complicate things further, Tanya and her mother have also been estranged for 24 years.

I’ve managed to maintain good relationships with both sisters, but things have come to a head. Their mother, whom I have personally cared for over the past five years with no help from anyone else, has just been admitted to a nursing home. Her dementia is worsening, and I believe this will be where she spends the rest of her life.

I suggested to Tricia that she reach out to Tanya and try to mend fences — at least enough for both sisters to visit their mother, even separately. Tricia flatly refused. Meanwhile, Tanya has no idea that her m

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