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Manx Genealogy

Skillicorns again

Hello. I have had a lot of helpful info on here before and am still trying to locate the correct parents and families for some of my ancestors.
1.. Henry Skillicorn (b c 1743) married Margaret Fargher (b c 1743) Their child John ( b c 1785 ) married Margaret Corrin.
Was Henry the son of John Skillicorn and Katherine Skillicorn ?
If not, who were his parents ?
2.. Who were the parents of John and Katherine ?
Thank you for any help on these.