the Isabella Corner who married Alfred Showler was the daughter of another Robert Corner, there's a marriage notice in the online newspapers.
I can't find a corresponding marriage, but this family has a couple of points that match, writing on the census not very clear
1891 28 High Dean St, Middlesbrough RG12/4009 folio 38 pg 27
Thomas Tunley head mar 34 engine driver b.Briley Hill, Staffs
Isabel wife 34 b Whitby, Yorks
Robert son 14 b. West Hartlepool, Durham
Lily dau 4 b. Middlesbrough
Thomas son 1 b. Skinygrove
death reg Thomas Tunley 34 june qtr 1893 Middlesbro vol 9d pg 349
1901 census Lily Tunley is in Stokesley, where the Foxton family are in some census years. Her birth cert would confirm mother's maiden name
Lily Tunley Middlesbro sept qtr 1887 vol 9d pg 522
There's a possible marriage june qtr 1899 for Isabella Corner to William Henry Smith Middlesbro vol 9d pg 1065 (the other 2 people on the page are together on the 1901 census) & then vaguely possible census
1901 21 Hutchinson St, Middlesbro RG13/4577 folio 107 pg 13
W H Smith head mar 51 mason's labourer b. Northampton
Isabella wife 48 b. Middlesbro
Chas son 11 b. Skiningrove
Thos son 10 b. Middlesbro
Gertie dau 8 b. Guisbrough
Thos W son mar 28 ironworker b. Middlesbro
Gib W grandson 7 b. Middlesbro
Thos John grandson 3 b. Middlesbro