Since Della May Johnston and Thomas Reeve Stark did not marry until May 31, 1899, I went looking for a first wife for Thomas, since James Clinton Stark was born Dec 15, 1891 and John Leslie Stark was born Feb 25, 1893. I believe Thomas was firstly married to Della's sister Mary Ellen Johnston and Mary Ellen died Jun 23, 1897.
I also believe there was another sister Martha Ann Johnston who married Daniel Orville Brown and Martha Ann died Feb 11, 1909 in Tilbury West, Chatham-Kent Municipality, Ontario. This was revealed by the obit of their father James in 1930, with three Brown grandsons.