Hi Linda
Thomas Hyam's parents were Charles and Ellen Hyam.
Charles Hyam was born in 1825, Thetford, Norfolk.
Ellen was born in 1818, Bradfield, Berkshire.
In 1851, before Thomas's birth, they were living at 101 Hadley Green, Monken Hadley, Barnet.
Charles' occupation at that time was farm labourer.
1851 England Census
H0107/1701/183 p 26
However I cannot find them in subsequent censuses that show Thomas, despite alot of searching.
Sharon