Looking for any record of a marriage for William (Willie) Lewin Kewley.

Margaret Lewin married John Joseph Kewley at St. Mary's Castletown 5th February 1858.
Willie was born June 29, 1859, Seelby, Ramsey, Isle Of Man. Christened 10 July 1859 St. Mary's Castletown. (Thank you kindly, Nigel Crowe!)

The 1881 Census finds the widow Kewley and her family in Moss Side, Lancashire:
(John Joseph Kewley d. November 8, 1864 in Liverpool)

7 Bold Street, Moss Side Lancashire, England
Head: Margaret (Lewin) Kewley, Widow, 44 b. (September 25, 1836)Douglas, IOM
Son William L Kewlwy, 21, Unmarried, b. (June 29, 1859)Castletown, IOM, Occupation: Clerk C.O.S.
Daur Ella Kewley, 19, b. (April 21, 1861) Castletown, IOM, School Teacher
Daur Eliza J Kewley, 17, b. (February 22, 1862) Ramsey, IOM, Milliner
Lodger Annie I Bridson, 26, b. Manchester, Lancashire, Eng, Invalid

I've been all through the online IGI with no luck. Unable to access the 1901 Census to check there...

Any suggestions greatly appreciated!
Barbara