DEAR ABBY: My niece-in-law, “Justine,” is a few years younger than my husband and I. We have been best friends for the last 25 years. She’s 55 and divorced, with a grown daughter but no man in her life. She’s extremely lonely and has only us as emotional support.

During the last year, she has had to move her 78-year-old mother (with whom she has a tumultuous relationship) in with her. Justine’s daughter has distanced herself from her mother because Justine has erratic moods. Recently, she sent me a four-page letter saying how angry she was with me and my family about things that never happened. She invented transgressions, insulted my grown children and targeted my daughter-in-law. My son is furious.

My husband, who loves Justine and feels like an older brother, says he wants to repair o

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