On the 1870 census, when John Johnston/Johnson is married to Margaret Jane Moffatt, he has 5 children - Whaley J. age 13, George age 11, Elizabeth age 9, John, and Thomas James.
http://www.rootschat.com/links/01u30/Of these children, I know that Whaley J., age 13 in 1870, died Jan 20, 1898 in Clinton, still single.
John Johnston died 26 Mar 1887 in Clinton, I believe still single.
Thomas James born 1869 in Clinton died 12 Mar 1899 in Clinton, married to Elizabeth Linton in 1892.
I wonder what happened to George. He is not on the 1880 census with remarried father John to Jane McClure but he would be age 21 by then so could be living separately. But I suspect that he died between 1870 and 1880 in Clinton. Can anyone help with George? Peggy