Joshua may not be the son of Thomas and Clarissa, per 1880 census.
Residences & events:
6/16/1880 Sumpter Twp, Cumberland Co, IL. At census time he was 14 years old and listed as a boarder and student, living in the household of Thomas and "Claracy."
6/26/1900 Spring Point Twp, Cumberland Co, IL. The census that year recorded Gush (Josh?) at age 34, his wife's name was Nancie, 21. They had been married 8 years with 3 children, all surviving: John F, 5, William L, 3, and Ira, 5 months. Next door was Lewis Elliott, 42, probably his brother.
The date posted is from cemetery records but If Josh died in 1919, why was his wife listed as a widow in the 1910 census? Could his death date actually be 1909?