1850 census of Montgomery Co., Ky, enumerated 15 July, lists on p. 45 as family #282:
James Conley, 33, labourer; Ann, 32; William, 14; Elizabeth, 13; Catherine, 10; George, 8; Maranda, 5; Mary, 7/12. All born in Kentucky.

1860 census of Bath Co., Owingsville P.O., enumerated 13 July, lists on p. 115 as family #130:
James Conley, 45, laborer, b. Ohio; Ann, 42, b. Ky; William, 24; George, 15; Catherine, 17; Rebecca, 12; Mary, 10; Charles, 7; Martha, 4; James, 1. All children born in Kentucky.

George and Catherine are both recorded as three years younger than would be implied by the 1850 census. Rebecca is apparently the same child as Maranda, and thus her age is also 3 years young. At least William and Mary bracket the group of children from 1850 with consistent ages.