I see from 'Manx Genealogy' and the IOM Family History Soc magazine that you are researching the Cretney family.
I am trying to piece all the Cretney families together using IGI, Census and other records.
I am also related to James C (christened 18 Sep 1743) through his son John (1783), grandson John (1808) and GGson John (1844)to my Gmother Esther Jane (1874).
My records show James married Margaret Faragher on 23 June 1765 at Marown.
His Parents were John C (1696) & Abigail Gell (abt 1700) who also had 10 children.
Where do you fit into their tree?