That's very interesting - many thanks, Frances, and for checking the wills.
Pity Robert's brothers didn't sign as witnesses to the property being transferred, but it seems that there were only John and William surviving (as guardians of Robert's children). - Don't know what happened to Edward.

Maughold bapts:
CORKILL James s/o Robert Corkill/ Cath Kissage Parish Church 4 Dec 1796.
Private baptism [Robert his "only son" in will.]
CORKILL Catharine Robert Corkill/ Cath Kissage Parish Church 28 Jul 1800
Private baptism
CORKILL Robert Robert Corkill/ Catharine Kissage Parish Church 1 Aug 1803
Private baptism
CORKILL Sarah Robert Corkill/ Catharine Kissage Parish Church 26 Mar 1807

Sue