I have in my data base Sanders Skiff b. 1765 Dukes, MA married Irenna Smith. They had four children, but no William in my record.
1880 United States Census for William T. Skiff
name: William T. Skiff residence: Rockford, Winnebago, Illinois birthdate: 1832 birthplace: New York, United States relationship to head: Self spouse's name: Margaret Skiff spouse's birthplace: New York, United States father's name: father's birthplace: Vermont, United States mother's name: mother's birthplace: Connecticut, United States race or color (expanded): White ethnicity (standardized): American gender: Male martial status: Married age (expanded): 48 years occupation: Carpenter nara film number: T9-0261 page: 166 page character: C entry number: 1309 film number: 1254261 Household Gender Age William T. Skiff M 48 spouse Margaret Skiff F 42 Phebe Lillibridge F 57