First, determine if two Perfect family lines in the United States have a common ancestor. One line is descended from Robert Perfect, born about 1750 in Virginia. He died in 1814 in Loudoun County, Virginia. The other line is descended from William Perfect, born 1747 in Virginia. He died in 1813 in Delaware County, Ohio.

Second, determine from what countries the Perfects originated. There is conjecture that their descendants were English, Scottish, French, or German.