Hi Andy, 
Can you post a census reference for the family? I can't find a matching George married to a Maria. 
The George married to Maria that I see (children Louisa, Annie F, Ada M, Beatrice) seems to give his birth place as Hanham in 1871, 1881 and 1901. Maria says Hanham in 1891 but Bitton/Clutton Somerset in 1881 and 1871. 
Am I looking at the wrong family? 
Other than that: Do you have the marriage cert? What does it say about their fathers?