On 9 Nov 1749 when Peter was 28, he married Abigail Johnson, daughter of Dea. Gideon Johnson (ca 1694-ca 1761) & Abigail Chatfield (2 Sep 1693-1761), in Derby, CT. Born 26 Jan 1730/1 in Derby, CT.

Peter and Abigail were half-first cousins once removed, her paternal grandmother and his father were half-siblings.

Children of Peter and Abigail (Johnson) Johnson:
    i. Eunice Johnson, d. 18 Jun 1825 at Salem, CT, m. at Waterbury 21 Oct 1762 Abraham Osborn (b. 5 Sep 1737 at New Haven, d. 13 Oct 1813 at Salem); and
    ii. Abigail Johnson, b. 20 May 1751, d. 1817, m. Joseph Short (b. 1748 at New London, CT, d. 30 Aug 1807 at Derby).

Ca 1747 Mary married Israel Trowbridge, son of Isaac Trowbridge (ca 1693-ca 1770) & Ruth Perry (5 May 1690-27 Jan 1767). Born ca 1722 in Stratford, CT. Israel was baptized in Stratford, CT, on 30 Sep 1722. Israel died in Fair Haven, Rutland County, Vermont in 1795.

On 21 Oct 1762 Eunice married Abraham Osborn (51111) , son of Daniel Osborn (53624) (18 Oct 1715-17 Dec 1812) & Obedience Smith (33923) (1 Nov 1719-18 Apr 1760), in Waterbury, CT.55 Born on 5 Sep 1737 in New Haven, CT.55 Abraham died in Salem, CT, on 13 Oct 1813; he was 76.55