__
__|__
_Philander Warren Duffield _|
| | __
| |__|__
_Frank Moreland Duffield _|
| | __
| | __|__
| |_Armilla Marsh _____________|
| | __
| |__|__
|
|--Warren Jennings Duffield
|
| __
| __|__
| ____________________________|
| | | __
| | |__|__
|_Lutica Friback __________|
| __
| __|__
|____________________________|
| __
|__|__