Gregg,

If IOM parish marriage records list the fathers of the two marrying, this may help in confirming the father of the Robert Corkill in Illinois. Listed in the on-line LDS IGI, there is a marriage record for a a Robert Corkill, who married a Jane Kennish, 21 Oct. 1865 in Maughold, IOM. The 1900 Henry Co, Illinois census for Robert and Jane Corkill indicates that they immigrated to the U.S. in 1866 and that all of their children were born in Illinois. Looks like the left IOM shortly after marriage.There are death record dates listed for a Robert & Jane Kennish Corkill in Kawanee, Illinois. (below)
**************************************************************************
CORKILL, JANE KENNISH -1921-10-28 HENRY-KEWANEE-
CORKILL, ROBERT -1937-01-23 HENRY-KEWANEE
**************************************************************************
Lionel