Daughter refuses to forgive mother for affair

DEAR ABBY: My older sister had an affair with an old boyfriend that lasted several months. She was 58 and had been married for 38 years. Her husband, who is a wonderful person and father of their three grown children, forgave her. He’s a devout Catholic, and divorce was out of the question. She has made every effort to ask for forgiveness from her husband and children and fix the issues in her marriage.