James Boswell's uncle John was a member of a sect known as the Glasites.
James GrantBorn May 19, 1738 in Scotland
Died Feb 18, 1811
8th Bart of Luss (1773-). Son of Sir Ludovick Grant (1707-1773) and Margaret Ogilvy (d. 1757). Married Jane Duff in 1763.
Grant was educated at Westminster School, London and at Christ's College, Cambridge. He succeeded his father as Member of Parliament for Elginshire in 1761, a seat he held until 1768, and from 1790 to 1795 was MP for Banffshire, succeeding James Ferguson.
Life with Boswell:
Boswell met a Mr. Grant, son to Sir Ludovic at Lady Frances Erskines on February 29, 1762.
Sir Ludovick Grant of Grant appears to have had only one son, which would make the Mr. Grant referred to James Grant. Incidentally, Sir Ludovick's first wife was Marion Dalrymple (d. 1735), an aunt of Boswell's friend and mentor in his early years, David Dalrymple.