Hi Ron, in the book History of Kirk Maughold, the Radcliffes say John Kerruish of Glen Vullin is the son of John Kerruish b. 1761 d. 1839, and Jane Kneale d. 1833.
Here is an outline.

Direct Descendants of John Kerruish

1 John Kerruish b: in Glen Vullin, Maughold, Isle of Man
. +Margaret Corteen m: 09 May 1670 in Kirk Maughold, Isle of Man
.. 2 John Kerruish b: 1676 in Glen Vullin, Maughold, Isle of Man d: 1746 in Glen Vullin, Maughold, Isle of Man Burial: 05 Feb 1745/46 Maughold, Isle of Man Christening: 21 Nov 1676 Kirk Maughold, Isle of Man
...... +Catherine Garrett d: 28 Dec 1740 in Glen Vullin, Maughold, Isle of Man Burial: 30 Dec 1740 Kirk Maughold, Isle of Man
....... 3 John Kerruish b: 1712 in Glen Vullin, Maughold, Isle of Man d: 1791 in Kirk Maughold, Isle of Man Burial: 31 Mar 1791 Kirk Maughold, Isle of Man Christening: 11 Jan 1711/12 Kirk Maughold, Isle of Man
........... +Sarah Callow b: 1721 in Ballaskeig, Maughold, Isle of Man d: 1795 in Kirk Maughold, Isle of Man m: 14 Feb 1741/42 in Kirk Maughold, Isle of Man Burial: 10 Mar 1795 Kirk Maughold, Isle of Man
....... 3 Daniel Kerruish b: 1721 in Glen Vullin, Maughold, Isle of Man d: 1809 in Kione ny Henin, Maughold, Isle of Man Burial: 05 Feb 1809 Kirk Maughold, Isle of Man Christening: 31 Oct 1721 Kirk Maughold, Isle of Man
........... +Margaret Costean b: 1730 in Kione ny Henin, Maughold, Isle of Man d: in Kione ny Henin, Maughold, Isle of Man m: 05 Oct 1751 in Kirk Maughold, Isle of Man Christening: 22 Jan 1729/30 Kirk Maughold, Isle of Man
............ 4 John Kerruish b: 1761 in Glen Vullin, Kirk Maughold, Isle of Man d: 1839 in Kirk Maughold, Isle of Man Burial: 08 Feb 1839 Kirk Maughold, Isle of Man Christening: 18 Apr 1761 Kirk Maughold, Isle of Man
................ +Jane Kneale d: 1833 in Kirk Maughold, Isle of Man Burial: 21 Feb 1833 Kirk Maughold, Isle of Man
................. 5 John Kerruish b: 1796 in Ballagilley, Kirk Maughold, Isle of Man Christening: 19 Jun 1796 Kirk Maughold, Isle of Man