David, it seems strange to be sending a message to someone wihth my name.
I was surfing the net and came across this board. I happen to be one of the Pleiss's from Southern Indiana. We are currently living in Warrick Co., just south of Gibsosn Co.
I don't really know much about the extended family, I can remeber my Father (Herschel Pleiss son of Harold and Margret)talking about Family up North. Unfortunately I never had the opportunity to meet any of them. My Uncle (Donald Pleiss) is still living, I'll see what I can find out from him.(might be able to fill in some blanks)