In 1851, Sophia is still with her parents (as Sophia L KENZIE), must be not long before her marriage to John which was Jun Qtr 1851.
There is this fellow in 1851:
Westbeer Street, Westbeer, Kent (spelling as on the image), Parish of Westbere, Kent
HO107/ Piece: 1625/ Folio: 193/Page: 3
Servant: John AMIS 22 (?) House Servant, b Westbeer
One of a number of servants in a large househould of one widow Frances FAGGE? or FUGGE?
An enumerator's check mark is made right thru the 2nd digit of his age - don't think it's a 7, but could be a 2 or 3 I think? Surname looks a bit like AMIE

but looks like AMIS to me.
Directly after him is a Head of House, James AMIS 77, and his wife. And after them is Head of House, Henry AMIS 74 and his wife Sarah.
I think you might need to acertain John's father's name from his marriage cert to Sophia.
Cheers
AMBLY