All born Stanhope and living there in 1851
Collingwood
Margaret, Pauper, Wid, 46
Thomas, son, Iron Stone Miner, 22
Joseph, 12, lead ore washer,
Margaret, 12,
William, 10, lead ore washer
John, 5
In 1841 Stanhope the same family have Joseph 35, coal miner, born in the county. Not sure if this is the family you are looking for.
However I can't find a marriage for Joseph and Margaret.