According to a letter of Sarah Van Dam, sister of The Reverend George Young, Sir Tancred Robertson [sic, Robinson] of Toplis [sic Topcliffe], Yorkshire was a near relation of Dr. John Young's mother. Hence the following for future research:

The family of Robinson has been traced back to the reign of queen Elizabeth. William Robinson, in the reign of king Charles the first, had issue,

1. Metcalfe, created a baronet by king Charles the second 30 July 1660, which title became extinct by his death. 6 February 1689.
2. Thomas.

William, son of Thomas, was created a baronet by king William the third 13 February 1690, and had issue,

1. Sir Metcalfe second baronet, who died 26 December 1736.
2. Sir Tancred, third baronet, a rear admiral of his majesty's navy. He married Mary, daughter and heiress of William Norton of Disforth in the county of York esquire ; by which lady he had issue
   1. Sir William, fourth baronet, who died 4 March 1770;
   2. Sir Norton, present and fifth baronet; Mary, married to Thomas Pierce of Pierceburgh in the county of York esquire;
   3. Elizabeth; and
   4. Margaret.

   Sir Tancred died 1754.

3. William, who died in the expedition to Carthagena 19 June 1741.
4. Thomas.
5. John, who died in the expedition to Carthagena -- ----- 1742.

Thomas, fourth son of sir William first baronet, was by king George the second employed in several foreign embassies, and was constituted 1748 ambassador extraordinary and minister plenipotentiary to the congress of Aix la Chapelle, together with John earl of Sandwich. He was declared 6 April 1754 one of his majesty's principal secretaries of state, which office he resigned in November 1755. By king George the third he was created baron Grantham of Grantham, and constituted 20 July 1765 joint post-master general, which office he resigned in December 1766. He had issue,

1. Thomas, second lord Grantham.
2. Anne, born 19 March 1742.
3. Frederic, born 11 October 1746, and elected 1781 and 1784 to represent the borough of Ripon in the county of York, but vacated his feat in December 1787. He married -- June 1785 , ----- ----- sister of James lord Malmesbury.

Lord Grantham died 30 December 1770.

Thomas, second lord Grantham, was son constituted in the year 1771 his majesty's ambassador extraordinary and minister plenipotentiary to the court of Madrid, from whence he was recalled at the breaking out of the war in 1779. He was appointed 9 December 1780 first lord commissioner of trade and plantations, which office was suppressed by a of parliament in June 1782. He was farther constituted 17 July in that year one of his majesty's principal secretaries of state, which office he resigned in March 1783. He married Mary Jemima, daughter of Jemima, marchioness Grey; by which lady he had issue,

1. Thomas Robinson, present and third baron Grantham of Grantham. Robinson was born 8 December 1781, and succeeded to the title upon the death of his father 20 July 1786.
2. Frederic, born 30 October 1782.
3. Philip, born 18 October 1783.

From GENUKI English Peerage 1790 Barons