On 7 Nov 1754 when William was 21, he married Joanna Waterman (48224) , daughter of Anthony Waterman (30590) (23 Jun 1716-1 Dec 1769) & Hannah Vaughan (30904) (25 Oct 1717-5 Aug 1798), in Halifax, MA. Born on 21 Oct 1736 in Halifax, MA. Joanna died in Sumner, Oxford County, Maine, on 11 May 1815; she was 78.