ignoring the nonsense re links with Stanley family

John Cowley + Maria Catherine Kelly m Braddan 18500409
in 1851 living #4 Windsor Park - John (+ fam all born Onchan) corn + flour dealer
in 1861 living #9 Wesley Terrace John (+ fam all born douglas) book keeper - civil parish of Onchan covers Douglas

Maria was almost certainly d/o Barnabas Kelly + Cath Croughan (marr Braddan 18240219) - bapt Douglas St George's 18330127
in newspaper 26 Sep 1832 re deaths from Cholera On Wednesday last, in this town, Mr Barnabas Kelly, shoemaker, aged 40 years.
Maria lin 1841 living with an 80 yr old Margt Croughan prob bur Braddan 18480320 age 85 - suspect mother also dead

I suspect Cath Croughan is d/o Daniel Croughan + Margt Kewley bapt Douglas St Matthew's 17950805 (possibly a twin) - however can't find marriage

There are several potential John Cowleys