David Johnston and Lena Elizabeth Croll had eight children that I can find. Some from 1900 census, and three more on 1910 census.

Harrison C "Harry" b: Oct 1889, Clarence V b: Apr 1892, Charles Leland b: Apr 1894, Robert H b: Dec 1890, Jessie M (f) b: Oct 1897, Frances E b: abt 1901, Margaret J b: abt 1903, and James b: abt 1906.

I also found a John Johnston age 79, and wife Mary age 68, living next door in the 1910 census, presuming them to be David's mother and father, and son William age 30.

Their name was Johnston on the census,not Johnson