I am delighted to have this obituary and death certificate although there is no information about his parents on the death certificate. I wonder why since his wife Charlotte Johnston nee Heideman lived until 1966, not sure of exact date, probably in Gilman, Illinois, where she was living when Robert William Johnston died.
Perhaps the obit of Thomas' daughter Ellen Suhre Oct 16, 1932 in Trent, Taylor Co., Texas, USA might have more info about her father Thomas since he lived with Ellen for some time, when her surname was Mulligan, and she is mentioned in his will written in 1894. Thomas was living with Ellen and her husband William Austin Mulligan in 1900, I think Chicago, and Thomas only died in 1901. Perhaps Ellen will have Thomas' exact place of birth, if we are really lucky. Really, really lucky.