Curlett now Corlett is one of the most common
Manx surnames . Originally most families were from the northern parishes. Have you any further details?
e.g. do you think son Thomas was a baby or older
boy / any family tales about the part of IOM they
came from / any surnames used as Christian names
which might identify John's wife. The IGI has dozens of
"Thomas son of John" entries. [ including my tree but not I think your ancestors ]