i wonder if you are looking for a pair of marriages ?

Given the youngest son William Edward is registered in St Georges in 1842

This later marriage may be what we see in the 1851 census

possible

Name: Lydia Foy ( or Joy ?)

Name: William Browning
Year of Registration: 1846
Quarter of Registration: Oct-Nov-Dec
District: St George Hanover Square
County: London, Middlesex
Volume: 1
Page: 11

If so is Lucy Lydia a FOY or a BALDWIN who married a FOY ?