Plumsted was married to Rebecca Kearney, daughter of Philip Kearny of Philadelphia, and whose sister Mary was the wife of Chief Justice John Kinsey. Before her death in 1741, they were the parents of: • Elisabeth Plumsted (1735–1799), who married
Andrew Elliot, a younger son of
Sir Gilbert Elliot, 2nd Baronet of
Minto. • Mary Plumsted (b. 1736), who died unmarried.
Descendants Through his daughter Elisabeth, he was a grandfather of Agnes Murray Elliot (1763–1860), who married
Sir David Carnegie, 4th Baronet, and Elizabeth Elliot (–1847), who married
William Cathcart, 1st Earl Cathcart. ==References==