You forgot to mention little clues?
Like he was born in Cambourne, and he was a tailor?
1851 census
Class: HO107; Piece: 1916; Folio: 223; Page: 15
Puges Hill, Cambourne, Cornwall
James, John Head M 43 Copper Miner
James, Johanne Wife F 41
James, John Son M 16 Copper Miner
James, William Son M 14 Tailor
James, Joseph Son M 12 Mine Labourer
James, Henry Son M 10 Mine Labourer
James, Ann Daughter F 8 Scholar
James, Mary Daughter F 6 Scholar
James, Nenjamin Brother M 22 Copper Miner all born Cambourne