I have found an 1860 Census entry for WILLIAM CONGROVE living in Meigs County, Olive Township, OH.Listed are:
WM Congrove age 51 Farmer Susan age 36 (possible second wife) Edward age 28 Laborer Sylvester age 19 Laborer Sally age 18 Melissa age 14 Elizabeth age 12 (probably also know as Betsy) George age 2 (possibly child by Susan)
Also living with them was Jacob Sheets age 13
I also have Franklin Congrove in the 1860 Meigs County OH Census.Listed are: Congrove Franklin age 32 Congrove Martha age 29 Congrove Amanda age 9 Congrove Randall age 5 Congrove Wesley age 3 Congrove Mary age 4/12
This looks like a match with your family records.Do you know where they may have lived in 1850?I did not find them in Olive Township in the 1850 Census.