You can buy a copy of the 1885 marriage at www.gov.im/registries/general/civilregistry (see Contacts).
The ref. to buy the cert (from Brian Lawson's marriage cert index) is KERRISH, Thomas, 3 May 1885, D, bra, 77b, CORRAN, Eliza Jane. Note that Brian has KERRISH, not Kewish (possibly misread - ask the Registry, as you have the page number).

You could probably make a guess about their parents from censuses, but it is better to be certain when the formal record exists, and the marriage will give you other helpful details, as well as both fathers.

Sue