Hannah is the niece of William. Her mother, Abiatha, is William's sister.
1870 Census:
Name: Hannah Gunn
Event Place: Sparta, Monroe, Wisconsin
Age: 49
Birth Year (Estimated): 1820-1821
Birthplace: New York
Occupation: House Keeper
HOUSEHOLD
Albert Hibberd 46 Vermont
Orpha W Hibberd 50 Vermont
Hannah Gunn 49 New York
CITING THIS RECORD: FamilySearch: [1]