“A.G.”, as he was known, lived in Richhill Township, Greene Co., PA.439

1900 Census, Richhill Twp., Greene Co., PA1200
Nelson, Armstrong, 33, b. Nov. 1866, married 5 years
Emily E., 27, b. July 1872, 1 child, 1 survives
Winnie R., 4, b. Oct. 1895

1920 Census, Richhill Twp., Greene Co., PA, Jan. 17, 1920, p. 2B726
Nelson, Armstrong C. [sic], head, 53, b. PA, parents b. PA, farmer
E. Elizabeth, wife, 47, b. PA, parents b. PA
Hazel I., dau., 19, b. PA, student
Olive M., dau., 16, b. PA, student

1930 Census, Richhill Twp., Greene Co., PA, Apr. 21, 1930, p. 8B407
Nelson, Armstrong G., head, 63, married at age 28, b. PA, parents b. PA, farmer
Emily E., wife, 61, married at age 26, b. PA, father b. OH, mother b. PA (contradicts 1920 census)

From newspaper obituary:
Armstrong Grim Nelson, 80, Dies
Graysville, Oct. 30. — Armstrong Grim Nelson, 80, of Graysville, R. D. 1, died at 3:25 a. m. today at his home, after a seven month illness. He had been seriously ill for five weeks.
Mr. Nelson was a widely known retired farmer. He was born Nov. 16, 1866, in Greene County, and was a son of Rufus and Evaline Grim Nelson. He spent all his life in Richhill Township. He was a member of the Fairview Methodist church and a member and past master of Harveys Grange.
Surviving are his wife, Elizabeth Jennings Nelson; three daughters, Mrs. Rae Staggers, of Graysville, R. D. 1; Mrs. Hazel Ruth, Washington, R. D. r, and Mrs. Mildred McGlumphy, of WInd Ridge; two brothers, W. E. Nelson, West Finley, and John R. Nelson, Graysville, and one sister, Mrs. Jessie Ferrell, of Graysville.1257