Manx Genealogy

Fell/Faile/ Fayle family

Paul Fell of Marown is my great x 3 grand fatherb 1770. He married Isabella Stevenson b 1774. They are both buried in Malew with headstones. On this I am OK. It is going back from here that I appear to have got mixed up,
I have Pauls Parents as Robert Faile b c 1738 and Christian Arthur b c 1739. Trying to find Robert I found a William who had a Robert b 1738 Marown. Mother Isabel Brew. When looking at wills; Robert died 1821 only mentions sisters Catherine and Margaret and no children. I then went to William d 1755 in Marown (of Cregwine) named Robert as a child, but is it the correct one ??? Oh dear I am going in circles. Thanks in anticipation. Also any help on Isabel Brew or Isabel Arthur would also be useful. Thanks Lynne