Maughold marriage:
29 Sep 1877
Robert BREW, Full age, Widower, Shoemaker, Ballacorteen, [father] John Brew (Deceased), Labourer, and
Margaret CORKILL, Full age, Widow, Ballajora, [father] William Callow, Tailor.

Compare with the earlier marriage I posted:
23 Dec 1860
James Callow CORKILL, Full age, Bachelor, Mariner, Maughold, [father] James Corkill, Shoemaker, and
Margaret CALLOW, Full age, Spinster, Maughold, [father] William Callow, Tailor.

It has to be the same Margaret!

Margaret daur of William Callow/Cath Kerruish bapt 27 Jun 1830?
Margaret Illegitimate daur of William Callow/Mary Corkill bapt 2 Jul 1837?

William Callow & Catherine Kerruish married Maughold 16 Mar 1822
William Callow & Mary Corkill married Maughold 11 Sep 1837

Sue