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Dear Abby: I am a retired Marine who married my supervisor's daughter. I'll call her "Zoe." He and I were good friends. Zoe and I divorced in 1997. During the marriage, I found out that he was not her real father. It was a family secret that accidentally got out.

Zoe and I had a daughter, "Ellie." When I discovered when she was 13 that she wasn't mine, I was furious. I eventually accepted Ellie as my own because I was the only father she had ever known, and it wouldn't change anything.

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.