Since Thomas Edison is in the Connection Finder this week, it might be helpful to include his grandmother, Nancy (Stimpson/Timson/Simpson?) Edison's ancestry.
A quick look over at her profile on FamilySearch suggests that her parents are Nathaniel Stimson and Elizabeth Claflin (both already on WikiTree, but not connected to her). I cannot see any sources which would connect the purported parents to Nancy. Wishful thinking, perhaps? Or is there a source out there hiding that led someone to this conclusion.
Geni's tangled mess indicates her father is a "William Stimson" with no other info.
So I'm just leaving this question for others on G2G since it left me wondering. I'm not in a position to solve it, but others might be.