I share your interest in the Rist (Riste, Reist) family of Fayette Co., PA.One of my ancestors, Simon Ruffcorn, was reported to have married the daughter of Christian Reist.This report was published in a History of Fayette Co., PA. I have been unable to prove this from another source. I do have some further information on the Rist (Reist) family, which I will look up for you if you are interested.
Simon Ruffcorn was a veteran of the American Revolution, originally from Bucks Co., PA, migrated to Fayette Co. after the Revolution. The related families lived at various locations in Tyrone and Bullskin townships of Fayette Co. One daughter of Simon Ruffcorn married a John Washington. His relationship, if any, to President Washington, has not been proven. Please e-mail me if you are interested in exchanging information.