On 1 Jun 1830 when Mercy was 21, she married Horatio Nelson Tilden (59489) , son of Capt. Jotham Tilden (49099) (10 Jan 1767-18 Dec 1843) & Betty Turner (56695) (14 Aug 1771-27 Jul 1817), in Marshfield, MA. Born on 8 Mar 1808 in Marshfield, MA. Horatio Nelson died in Marshfield, MA, on 19 Nov 1886; he was 78.