John Henry Nicholson's wife was Alta Lee Wilson and their son, Edward Clark Nicholson was born on 2 Jan 1910 in OK. Edward died 24 Jul 1968 at Perryton, Ochiltree, Texas.
Another son, Albert Floyd Nicholson was born 2 Sep 1929 who died 2 Nov 1973 at Perryton, Ochiltree TX.
These two records are taken from "Texas Deaths, 1890-1976," database with images, FamilySearch