On 7 Nov 1747 when Mercy was 20, she married Thomas Foster (48755) , son of Thomas Foster (34221) (19 Mar 1705-25 Jan 1777) & Lois Fuller (31386) (23 Sep 1704-21 Sep 1743), in Plymouth, MA. Born on 7 Jul 1727 in Plymouth, MA. Thomas died in Halifax, Nova Scotia ca 1778.