DEAR ABBY: For the past 25 years, my husband and I have shared a close friendship with my niece-in-law, “Justine,” who is a few years our junior. At 55, Justine is divorced, with an adult daughter, but without a partner in her life, leaving her feeling quite isolated. We are her primary emotional support network.

Recently, Justine had to accommodate her 78-year-old mother in her home, despite their strained relationship. Her own daughter has distanced herself due to Justine’s unpredictable moods. This tension escalated when Justine sent me a four-page letter full of unfounded accusations against my family, including insults aimed at my children and daughter-in-law. My son is understandably upset.

My husband, who cherishes Justine like a younger sister, is eager to mend these family ties. Although I value my husband’s feelings, my priority is my children, and I am taken aback by his lack of outrage over the false accusations against me. He believes we should work through this issue (notably, he wasn’t mentioned in her letter). I’m trying to brace myself for future family events. How can we heal this rift? — SEEKING SOLUTIONS IN THE SOUTH

DEAR SEEKING: If Justine is fabricating events to justify her anger, it may indicate a mental health issue. Until she acknowledges that her behavior is pushing away those who care most about her, the situation could deteriorate. Encourage your husband to persuade Justine to seek the necessary help. You can extend forgiveness for the pain she’s caused, hoping she’ll recognize the need for change.

DEAR ABBY: My older sister believes she is superior to me, often making cutting remarks under the guise of humor. This has led to several significant disputes over the last seven years. The latest argument erupted over some missing money. She has a history of stealing from various sources, including hospitals, doctors, family members, and even her boyfriend’s family. Discovering she had taken money from me was the final straw. When confronted, she declared I was “dead to her,” and we haven’t spoken since.

Her boyfriend died last week, and she hasn’t told me. (I found out on social media.) Should I reach out to her about funeral arrangements or contact his family instead? His family never really talked to any of us. They didn’t like her because they thought she was only there for his money. — OUT OF THE LOOP IN ARIZONA

DEAR OUT: Unless you feel the need to attempt to make up with your troubled sister, do not reach out. However, if you want to do something for the boyfriend’s family, send them a nice condolence card expressing your sympathy.

Dear Abby is written by Abigail Van Buren, also known as Jeanne Phillips, and was founded by her mother, Pauline Phillips. Contact Dear Abby at www.DearAbby.com or P.O. Box 69440, Los Angeles, CA 90069.