I think Sandra is correct. There is a marriage of Richard Lewis to Mary Hotchkiss on 10th December 1838 in Shrewsbury, Shropshire.
There are in Condover, Shropshire, in 1841, with the same ages as the 1860-70 censuses.
I can't see them in 1851, so they may have left England before the census.
Either the 1850 census is a different family or the name of Mary's husband is an error.
Sorry for any of my errors.
David