1901, Malew, district 1, schedule 46, St. Marks Road
William Crellin, head, married, 39, contractor, Braddan
Fanny, wife, married, 35, Santan
Catherine, daughter, 9, Braddan
William, son, 7, Braddan
Mary, daughter, 5, Braddan
Henry, son, 3, Malew
Elsey, daughter, 11 mos, Malew

As William & Fanny did not marry until June 1892, Catherine would appear to be of a previous marriage or illegitimate.

I've been stuck in a snow drift in Toronto for the past couple of days so don't have access to all my files. Can't track down Catherine any further.