Emma was born about 1860. She passed away about 1943.
United States Census 1860, Hawley, Franklin, Massachusetts,. William P. Wing, age 22; Clarissa E. Wing, age 20; Clara E. Wing, age 1mo. (Date taken: 21 Jun 1860) 
United States Census 1880, Sunderland, Franklin, Massachusetts. William P., age 42; Clara E., age 39; Clara E., age 19; William H., age 14; Dora V., age 12; George W., age 6; Luther W., age 3mos. 
Massachusetts, Town Clerk....Town Records, 1626-2001. Marriage of Henry H. Percival and Emma C. Wing on 29 Dec 1887 at Greenfield, Franklin, Massachusetts. (Groom's father: Reed Percival; Groom's mother: Elzina Heath Percival) (Bride's father: William P. Wing; Bride's mother: Clara White 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. Vincent (daughter), age 21; Florence M. Vincent (granddaughter), age less than 1mo. 
Emma C. (Wing) Percival was buried at Green River Cemetery, Greenfield, Franklin Co., MA. Find A Grave Memorial ID 119430732.