Unknown Mr. Rex married unknown Woman in PA, one son Daniel.
Daniel married Margaretta Sparks, born in PA of French/English parentage. They migrated to Canton, OH and had 4 children:
Joseph, Jane, Elizabeth (b. 1816) and George.
Elizabeth married Andrew Rader (b. 1811) and they had 10 children:
Katherine, James, Mary Lucinda, Margaretta (b. 2/22/1836), Elizabeth, Sarah Ann, George Oscar, Jeese Finley, William Henry and Gertrude Arabelle.
Margaretta married William Penn McCormack on April 14, 1852 in Rushville, Indiana.They had 9 children, one child - George Jesse McCormack married Grace Noon and they had one child, Calla Grace, who is my Grandmother.
I note that you have researched the Chamberlin Family, and so suspect that you are of the Clara May McCormack Family.