The late Elva Wriker meticulously researched our family's French ancestry for a large part of her life.Her book is an excellent source of information.
It looks like you've stumbled onto what some of us like to call the "family vine."The Peugeot/Louys/Grisier/etc. lines all came from the region of Montbeliard, near the Swiss and German borders.The Grisiers came mostly from the small village of Bretigney (Ile de Doubs) and the Louyses and Peugeots from Valentigney (the Peugeot factory is/was in Valentigney).Basically, being related to a Peugeot makes you related to pretty much every French family in Williams County, and Montbeliard for that matter.Names are duplicated again and again in the family, with at least a dozen Jean-Georges Grisier/Louys/etc.Researching things in the US is difficult for this reason, along with the fact that named were haphazardly Americanized (e.g., a Pierre would go by Peter half the time).
The good news is that a lot of your work has been done for you.If you'd like a copy of my family tree (which has a few Peugeots in it), I'd be happy to share.
P.S.The Peugeots in Stryker were directly related to the Peugeots in France.My late grandmother (a Besancon) told a story about the factory owner traveling to Stryker to attend a Peugeot funeral.Needless to say, the village did not impress him, especially since his relatives had written him about the wealth and prosperity they were enjoying in the United States (they were actually farming, just like almost every other French family at the time).