Here is census information:
1870 Warren Co., Iowa, Union Township:
Thomas McRae, age 41, b. Ken., farmer
Nancy, age 40, b. Ind.
William, age 20, b. Ind., idiotic
Charles, age 19, b. Ind.
Mary, age 17, b. Ind.
Franklin, age 16, b. Ind.
Isadora, age 12, b. Iowa
Nancy, age 10, b. Iowa
Josephine, age 9, b. Iowa
Thomas, age 7, b. Iowa
Grant (I think, hard to read), age 5, b. Iowa
Joseph, age 4, b. Iowa
Elmer, age 2, b. Iowa
Edgar, age 2 mos., born March, Iowa
Next door is Mary Bowen, age 65, b. Ken. and son William, age 36, b. Ind.
1880 Warren Co., Union Township:
Thomas has apparently died and Nancy has remarried to a much younger man:
Eutsher, Enos (hard to read last name, could be Cutsher), age 26
Nancy, wife, age 50, b. Ind.
McRae children William, Jane, Thomas, Joseph, Edgar, Willis, John listed as step-children, Fred McRae, grandson.