He married at St. Antholin, 17 November 1775, Miss Julia Henrietta "Harriet" Blosset from a well connected huguenot family (d. 18 January 1819, at Hanwell), second daughter and co-heir of Solomon Stephen Blosset of Dublin & Meath (grandson of Salomon Blosset de Loche), by his wife Elizabeth Dorothy Le Coq St. Leger, from Trunkwell House at Shinfield (now Beech Hill) in Berkshire. Harriet Blosset was the girl who in 1768 had been led to believe by Sir Joseph Banks (1743–1820) that he would marry her on his return from his journey with Cook on the Endeavour. They returned in June 1771 but Banks's previous affections had been irrevocably changed by his 3 years of living with the Tahitian natives; compensation was paid.