The Smith family

Hello all, I've recently been reseaching my family tree and it turns out they come from Mathon. The family name was Smith. I know this is quite a common name, to say the least. The furthest back I have been able to go is 1841 using the census. The name of the couple is William and Elizabeth Smith. They had a son called James. When we get to the 1851 census James has disappeared but they've got 3 more children called William, Eliza and George. Does anybody have any more information on this couple or family?Thank youBen Potter