William and Mary are in the 1880 census, with a daughter Cora. Their son Oris D. is living with his grandparents for that census.

1870 Indiana, Noble County, Wayne Township, Post Office Kendallville, page 6
dwelling 39, family 40
Frink [sic], George, age 45, male, white, farmer, real estate $12000, personal $1000, born Ohio
-------, Elisabeth, age 46, female, white, keeps house, born Wurtemburg
-------, Lydia, age 21, female, white, no occupation, born Ohio
-------, Mary, age 10, female, white, born Indiana

1880 Indiana, LaGrange County, Milford Township, E.D. 24, page 2B (taken 3 June 1880)
dwelling 9, family 9
Cannon, William, white, male, age 25, head, married, farmer, born Indiana, father born Pennsylvania, mother born Ohio
----------, Mary, white, female, age 19, wife, married, keeping house, born Indiana, father born Ohio, mother born Germany
----------, Cora, white, female, age 1, daughter, single, born Indiana, parents born Indiana

1900 Indiana, LaGrange County, Milford Township, E.D. 77, sheet 1A, stamped page 109 (taken 1 June 1900)
dwelling 4, family 4
Cannon, William, head, white, male, Mar 1855, age 45, married for 24 years, born Indiana, father born Pennsylvania, mother born Ohio, farmer
----------, Mary E., wife, white, female, June 1861, age 38, married for 24 years, mother of 3 children, 3 living, born Indiana, father born Ohio, mother born Germany
----------, Cora, daughter, white, female, Oct 1879, age 20, single, born Indiana, parents born Indiana
----------, Sorates, son, white, male, July 1881, age 18, married for 0 yrs, born Indiana, parents born Indiana, farmer
----------, Myrtle, daughter-in-law, white, female, Oct 1880, age 19, married for 0 yrs, mother of 0 children, born Indiana, parents born Ohio

1910 Indiana, LaGrange County, Milford Township, Stroh Billage, E.D. 101, sheet 17A, stamped page 169 (taken on 11 May 1910)
dwelling 333, family 337
Canon, William H., head, male, white, age 55, married once for 34 years, born Indiana, father born Pennsylvania, mother born Ohio, laborer at odd jobs
--------, Mary A., wife, female, white, age 50, married once for 34 yrs, mother of 2 children, 2 living, born Indiana, father born Germany, mother born Ohio
--------, Cora C., daughter, female, white, age 30, single, born Indiana, parents born Indiana

1920 Indiana, LaGrange County, North half of Milford Township,E.D. 125, sheet 5A, stamped page 28
dwelling 106, family 108
Canon, William H., head, owns, male, white, age 65, married, born Indiana, parents born United States, farmer laborer
--------, Mary E., wife, female, white, age 59, married, born Indiana, father born Pennsylvania, mother born Germany
--------, Cora L., daughter, female, white, age 40, single, born Indiana, parents born Indiana

1930 Indiana, LaGrange County, Milford Township, Stroh, E.D. 44-12, sheet 12B (taken 29 April 1930)
dwelling 329, family 329
Cannon, William H., head, owns $800, no radio, male, white, age 75, married at age 20, born Indiana, father born Pennsylvania, mother born Ohio, odd jobs laborer
----------, Mary E., wife, female, white, age 69, married at age 16, born Indiana, father born Ohio, mother born Germany
——————————————deceased