I have not researched this but I have a copy of the book Valentin Alt His Children and His Grandchildren by Nellie Wallace Reeser, 1949. She states in the book that there is strong evidence that Washington Ault of Porter Co. IN was a son of Michael and Hannah Alt of Henry and Porter Co. IN. Michael was the son of Valentine Alt and Catherine Lau and the grandson of Valentin Alt who d. 1755 York Co PA. I'm sure there are other Alt researchers who can enlighten you more on this.