I think this is your family in 1851:-
HO107/2498 folio 238, page 2
DAVIES, James , h, m, 40 ag lab, MGY Churchstoke, Cwm, /f238/p2,
DAVIES, Ann, w, m, 37, , MGY Churchstoke, Cwm, /f238/p2,
DAVIES, Hannah , d, , 11, , MGY Churchstoke, Cwm, /f238/p2,
DAVIES, Emma , d, , 9, , MGY Churchstoke, Cwm, /f238/p2,
DAVIES, Sarah , d, , 5, , MGY Churchstoke, Cwm, /f238/p2,
DAVIES, James , s, , 2, , MGY Churchstoke, Cwm, /f238/p2,
DAVIES, John , s, , 8m, , MGY Churchstoke, Cwm, /f238/p2,
RALPH, Mary, rel, , 3, , LDN London, Cwm, /f238/p2
Obviously the older children would have left home. I did do a search for William, Thomas, Mary, Anne & Martha but they are such common names and several of them appear, born in Churchstoke.
Let me know if you need any other info.
Jan

Modified 18:26 - THIS IS THE WRONG FAMILY SO IGNORE!!!!!! SORRY, I HAD GOT THE AGES INCORRECT.