I see that Thomas's eldest son was named Lewis, so how about this family in 1841:
Llanfair Street, Llanrhydd, Ruthin
HO107/1404/20/6/7
Lewis Lloyd, 45, ag lab
Sarah, 35
Margaret, 11
Ellinor, 9
Elizabeth, 6
Simon, 5
John, 3
All born Denbighshire
On the 1851 census, John is down as being born Llanbedr:
Lodge Ucha, Ruthin
HO107/2504/277/8
Lewis Lloyd, 56, Ag Lab, b. Cerrigydridion
Sarah, 50, b. Gyffylliog
John, 13, b. Llanbedr
Martha, 6, b. Llanrhydd
JL