Ethel was born about 1890. She passed away about 1918.
Massachusetts Births, 1841-1915. Ethel May Percival was born 24 Nov 1888 in Greenfield, Franklin, Massachusetts to Henry H. Percival and Carrie E. Wing. 
United States Census 1900, Greenfield Town (east part), Franklin, Massachusetts. Henry, age 43; Emma C., age 40; Ethel M., age 12; Raymond E., age 9. 
United States Census 1910, Greenfield, Franklin, Massachusetts. Henry H., age 52; Emma C., age 50; Benson F. Vincent (son-in-law), age 22; Ethel M. (Percival) Vincent (daughter), age 21; Florence M. Vincent (granddaughter), age less than 1mo. 
Massachusetts Marriages, 1841-1915. Marriage of Harland S. Jillson and Ethel May (Vincent) Percival (this is her second marriage) on 4 Jun 1914 at Brattleboro, Windham, Vermont. (Groom's Father: Herbert Jillson; Groom's Mother: Annie Jillson); (Bride's Father: Henry H. ((Vincent, this last name is incorrect))last name is Percival; Bride's Mother: Emma C. Wing) 
Ethel May "Elsie" (Percival) Jillson was buried at Green River Cemetery, Greenfield, Franklin, Massachusetts. Find A Grave Memorial ID 119430761.