I am also a descendant of David Manhard and Elizabeth Blass through their son Peter. One of his sons, William Manhard, was converted to the Church of Jesus Christ of Latter-day Saints (Mormons) in Ontario in 1837 and followed the church to Missouri, Illinois and Utah.
His descendants are scattered throughout the United States, but primarily the West. Just a few days ago I went to Kingston and Elizabethtown, Ontario, in search of family history information. Last year, I visited the family site in Germantown, New York. I would be pleased to collaborate.