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Use "step-father" in a sentence
"Aunt Ruty had called my step-father, Edward’s, mother, and gotten the number where they were staying."
"If he were traveling with an Indonesian passport that would indicate he relinquished whatever previous citizenship he held, British or American, prior to being adopted by his Indonesian step-father in 1967."
"This story happened to my step-father, and I will repeat it here just as I was told it."