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Mary Mottley is the daughter of Jim T. Mottley and Emma Mae Kneeland. Her siblings were Dorothy Mottley, Earnest Mottley, Regina Mottley, Cleo Mottley, Viola Mottley, Jerry Mottley, Morris Mottley, Leshell Mottley, Alfred Mottley, Karen Mottley, Angela Mottley, Agnettia Mottley, Jim Mottley, Charlie Mottley.
Mary Mottley's husband is not known. They had three known children named Malcolm , Jr. Mottley, Melvin Mottley, and Miranda Mottley.