JOHN H. MERTENS (born 1862) son of Frederick A. Mertens (1824 -1886). Searching for descendants of John H. Mertens, who reportedly fathered John Frederick Mertens (1893). John Frederick's mother was Mary E. Barnes (1871-1914). Mary Barnes was unwed at the time of her son's birth. She later married Scott Morgan. John H. Mertens never married; he reportedly fathered other children.