I found my wife's great-grandparents in the 1900 United States Census of Sergeant Township, Douglas County, Illinois. John William Hanks and Amanda Ann Craven were her paternal grandmother's parents. They are listed here in dwelling # 209, household # 209, as John and Mandy A. Hanks. Their daughter Ethel M., who is listed on the record as being 3 years old, was my wife's grandmother.
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I retrieved this page today from the Family Search, Records Search website. Click on this link to go to that site.