 They had 4 sons and a daughter.The sons included his first son and heir Sir Richard Duckworth King, 3rd Baronet and his second son vice-admiral Sir George St Vincent King (later Duckworth-King), who succeeded his elder brother as 4th baronet.His second wife was Maria Susannah, the daughter of Admiral Sir Charles Cotton, 5th Baronet, with whom he had a further 4 sons and 3 daughters.