The occupation of John Knight (husband of Charlotee Kyme/Kime) is listed as "Baker Journeyman". I got this from her death certificate and also the birth cretificate of their son (John Harold Knight - DOB 1/1/1900).
We really don't know anymore about my wife's grandad, or if he had any brothers or sisters. After his mothers death it looks like he was semi-adopted by a neighbour (he is living with the neighnour in the 1901 census) but it looks like he was the only child.
CaroleW - How did you find the marriage record for Charlot Knight and John G Knight?? Do you have an index that lists the details, or did you access the marriage certificate?? I am using the search on Ancestry.co.uk and it only shows me the surname, it doesn't show the person they married (I think this came in later years).
By the way, thanks for all the helpful suggestions.