His portrait exists at Antony House, Torpoint, Cornwall, formerly the home of his second wife Sarah Carew.
Jonathan's mother was Joan Pollexfen (born 1620), a daughter of John Pollexfen of Kitley, Yealmpton, Devon , y his wife Cicilia Harris, daughter of John Harris of Radford, Plymstock, Devon.
[3] He served as MP for the family's pocket borough of Fowey from 24 May 1675 to March 1681 and again from 1689 to 1695.
He remarried in 1681 to Jane Carew (died 1700), a daughter of Sir John Carew, 3rd Baronet (1635–1692) of Antony, Cornwall, by whom he had four sons and four daughters including: He died and was later buried on 11 September 1702.
He bequeathed funds for the upkeep of eight poor widows in the almshouses built by his grandfather.