Lord Alvingham married, firstly, his first cousin Dorothea Gertrude, daughter of John Eardley Yerburgh, in 1911. They had one son and two daughters. After her death in 1927 he married, secondly, Maud Lytton Grey Morgan, daughter of Charles Ford Morgan (an actor known professionally as Lytton Grey), in 1936. They had no children. Lord Alvingham died in November 1955, aged 65, and was succeeded in the barony by his only son Robert. Lady Alvingham died in 1992.
References
Kidd, Charles, Williamson, David (editors). Debrett's Peerage and Baronetage (1990 edition). New York: St Martin's Press, 1990, [page needed]