Manx Genealogy

Sarah Fell b 1807 Douglas

Her parents are Paul Fell and Isabella Stevenson . I have her marrying William CREBBINin 1831 Braddan. There is a child b 1835 called James Nelson CRELLIN bap Douglas. This is most probably correct because Nelson is a family name. There is another child Isabella ann CREBBIN b 1832 at Braddan. I think she died 1837.
After that the trail vanishes, Can't find in 1841 or after. Any help please.