I can find Mary Forbes in Census 1851 and 1861 but not Mary Storey.
1861 Census, Durham District
Family Number: 21773.6
Framwellgate Moor Village, Newcastle Row
Michael Forbes, head, married, 45, coal miner, born in Gateshead, County Durham
Ann Forbes, wife, married, 39, born in Winlaton, County Durham
John Forbes, son, 19, coal miner, born in Cassop, County Durham
Mary Forbes, daughter, 14, born in Ferryhill, County Durham
William Forbes, son, 10, born in Cassop, County Durham
Jane A. Forbes, daughter, 7, scholar, born in Cassop, County Durham
Elizabeth Forbes, daughter, 5, born in Crook, County Durham