David,
It's proving to be a difficult one to get the answers we need. IF the 1911 census with James, Sarah etc is the Brown family we need then it's only Benjamin that we can find a fair amount of info on. The following link will show.
1901 census, 1911 census, marriage details and more. He enlisted twice and his service papers have survived (the 1940 bombing) but sadly his next of kin shown are for his wife and their children only and no mention of parent(s) or siblings. An address for him on marriage certificate (m. 1908) is 3 back 15 ?????? Row, not very clear
Peter