Hello Frances.

Thank you for your help. I am starting to realize you are the Manx research guru in the chatroom. I have used ancestry.com, familysearch.org and www.imuseum.im.

One sibling that I could not find a baptism record for is an Ann Corkill, born in the Isle of Man about 1819. She appears on the marriage certificate of William (my 3xGG) and the death certificate of his brother John Corkill, both of which I found baptism records for as children of Thomas Corkill and Elizabeth Lewin. Her marriage certificate also lists "Thomas Corkill, Joiner" as her father. Same as the two sons.

Two apparent brothers (Philip and Edward, born in 1808 and 1815, respectively) are also absent.

It's frustrating.