I have some electronic copies of old letters Between the Craine Family (IOM) from 1953-1955.

Isabella Craine was married to a Richard Cowley in June of 1955. They could possibly be the parents of James, as James was also the name of Isabella's father (there is no mention of Richard and Isabella's children in the letters, that I can discern)

Also Richard Cowley's father was John Cowley Knockbane, he may have had other sons.

I hope this will give you a little more information for your search.