I found one of Wm. H. Agnew's daughters in the 1910 and 1920 census of Hamilton Co, TN: 1920 Hamilton Co, TN Mission Ridge Twnshp Series: T625Roll: 1743Page: 182 Dettor, William J. M W Head 45 VA "Lella A. F W Wife 42 TN PA PA "William M W Son 18 TN VA TN Agnew, William H. Father-in-law 79 PA PA PA
1910 Dettor,William M M W 36 VA VA VA Pole Installer Telegraph Co , Lettie B. F W 32 married 10 yrs 1 child 1 living TN PA IA ,Melville M W 8 M W sonTN VA TN
I am told the following are the children of Wm H. Agnew and Melissa Hesson - but I cannot find them in the 1880, 1890 nor 1900 census: Lisle H. Agnew (male) b: BET. 1866 d. 1868 in Scott Co, IA Angela Agnew b: 17 MAR 1867 in IA d. 1907 Donley Jebbron Agnew b: 10 JUN 1870 in Scott Co, IA d. 9 Sept 1871 Earl Agnew b: 23 AUG 1872 in IA d. 1874 Eda Flora Agnew b: 28 OCT 1874 in Knoxville, TN - (I am told Eda married William Melville Dettor) Lella or Letta b. 1878 (Looks like this is the wife of Wm. Detter in Hamilton Co, TN). Perhaps Mr. Detter married first Eda, who died, then married Letta?Or perhaps the info on Eda has the wrong birth info and she is Lella/Letta.
I believe William Henry Agnew was the son of David Agnew and Susannah Schaide Holler.