On 31 Jan 1754 when Peter was 27, he first married Rebecca Poole (41790) , daughter of Samuel Poole (21956) (10 Apr 1700-8 May 1752) & Rebecca Williams (-6 Feb 1763). Born 11 Jan 1730/1 in Reading, MA. Rebecca died in Reading, MA on 7 Oct 1758.

On 14 Jul 1761 when Peter was 34, he second married Mary Dix (50810) , daughter of Samuel Dix (41101) (7 Feb 1705/6-21 Sep 1802) & Hannah Batchelder (33728) (22 May 1709-), in Reading, MA. Born 2 Feb 1739/40 in Reading, MA.81 Mary died in Randolph, MA on 10 Feb 1823.