He had a twin sister Frances, who married Hans Widman Wood of Rosmead, County Westmeath and had issue, including Isabella.
[1] On 22 May 1755 he succeeded to the family baronetcy following the premature death of his elder brother, Robert King, 1st Baron Kingsborough.
On 15 July 1764 he was elevated to the Peerage of Ireland as Baron Kingston and assumed his seat in the Irish House of Lords.
[2] Lord Kingston held the office of Custos Rotulorum of Roscommon between 1772 and his death in 1797, and was made a member of the Privy Council of Ireland on 20 January 1794.
of Kilronan Castle, County Roscommon: they were the parents of Edward King-Tenison, the Whig politician and pioneering photographer.