1850 U.S. Census, Essex County, Virginia
Sheet 95
Dwelling 573, Family 573
Duff, Peter, 30, male, farmer, value of real estate $1,500, born in Virginia
Duff, Olivia, 28, female, born in Virginia
Duff, Olivia, 12, female, born in Virginia, in school
Duff, Robert, 10, male, born in Virginia, in school
Duff, Peter, 8, male, born in Virginia
Duff, Julia, 6, female, born in Virginia

1880 U.S. Census, Essex County, Virginia
Chapel Grove Precinct
Page 205 (26)
Dwelling 236, Family 236
Duff, Peter T., white, male, 64, married, farmer, born in Virginia, both parents born in Virginia
Duff, Olivia A., white, female, 67, married, keeping house, born in Virginia, both parents born in Virginia
Duff, Peter A., white, male, 32, son, single, works on farm, born in Virginia, both parents born in Virginia
Duff, Olivia A., white, female, 21, daughter, single, at home, born in Virginia, both parens born in Virginia