Also, I have just re-checked your information and it was a huge help. I have confirmed that Isaac and Catherine are James' parents. I am just trying to confirm 3 birth years of Isaac's children (Elizabeth, Mary A and Isaac)
It definitely seems to me that James Kemble is the son of Isaac and Catherine although there is one mystery.
First, in 1891 the family includes a James shown aged 9 bc.1882 BUT there is no James under any variation of the name bc.1882 - I think that the age 9 should probably have read 19 (rather than 17 which would have been correct although if you compare the various census for the family their ages often a couple of years out).
Right, the mystery is that in 1881 census their youngest child is shown as Catherine bc.1868 - however, they had at least 5 children born in the 1870's i.e.
William born June 1871 as Cemble - died Dec.1872 as Kembell
James born Mar.1874 as Cemble (shown as 9?? in 1891)
Esther born Mar.1876 as Camble
John born Jun.1878 as Kemble (shown as 10?? in 1891)
William born Sept.1880 as Cemble
(2 that were born in 1880's were Sarah Ann and Samuel both shown as 7 in 1891 - however, Sarah Ann was born (as Camble) in Sept.1882 and Samuel born Mar.1885 (as Kemble) so you can see what I mean about ages in 1891 being up the creek with also James and John with wrong ages!)
The eldest William had died - but where were the other 4 children in 1881? Did the enumerator simply miss them off somehow?
Anyway, after all that I'm pretty sure that if you get the birth certificate for James Cemble birth Mar.1874 it will confirm his parents as Isaac/Catherine (or indeed his marriage certificate) even though he and 3 younger siblings are 'missing' in 1881.
Annette