Pilot.FamilySearch.org had census records.
Charles MILNER, in 1900, was of Twp. 95 - 68, Gregory Co., SD, b. Oct. 1869, MI, parents b. NY & PA; wf. Bertha M., b. Nov. 1871, IA IL KY, had 2 ch., 2 living, b. SD: Neva M., Je. 1896, & Lorin C., Sep. 1899.
SD Births (online) Neva, b. 13 June 1896, Hutchinson Co., & Lorin, b. 27 Sep. 1899, Gregory Co.
Census of 1915 says Charles NILNER, 45, MI NY PA, Methodist, m. 1859, Bertha JORDAN.
Clarence O. NASH (10 Jan. 1857, Des Moines, IA - 23 Jan. 1919, Mobile, Mobile, AL; bu. Martin, SD) husband of Etta HIGGINS, son of Charles W. NASH & Francis BARNES, both b. MI.
1920, Etta H. NASH, widow, 48, MN ME MA.
Bennett Co., 1920, Charles MILNER, 50, MI NY IL, with SNYDER family.
Census of 1925, says Charles MILNER, 55, MI NY IL, Presbyterian, had m. 1922, HAGENS [HIGGINS].
Martin, Bennett Co., SD, 1935, Charles MILNER, m. 1922, Ella [sic, Etta] HIGGINS.
SD State Historical Society, Cemetery Records, online: MILNER, Charles, d. 16 July 1952, Etta B., d. 22 Feb. 1952, bu. Martin Community Cemetery, Martin, Bennett Co., SD.
--not my family