For such a common name as John Baker, it is too big a jump to go from one census in 1901 back to trying to pinpoint a birth, so I was hoping to go one step at a time and trace him back through the censuses, see if he is consistant with age and pob, etc etc.
However, there is no obvious candidate in 1891, and with the eldest child in 1901 being age 9, it means he could be married or single in 1891 .... so even less easy to pin him down!
So- really need his marriage, but with names like John and MAry and not knowing where, that is not straightforward.
So we really need a child's birth cert to give MAry's maiden name!
SO- on the birth cert that you have for your husbands grandad, where you say father was John Baker, what maiden name did it give for his mother, Mary?