James Boswell's uncle John was a member of a sect known as the Glasites.
John SpottiswoodeBorn ca. 1720
Son of John Spottiswoode (d. 1728) and Helen Arbuthnott (ca. 1675 - 1741). Half-brother (on mother's side) to Walter Macfarlane. Married (1740) to Mary Thomson (daughter of John Thomson of Charleton).
Life with Boswell:
Spottiswoode was at Macfarlane's in London when Boswell visited on March 13, 1763.