This is especially interesting to me since I also have a family story that involves US Grant. According to the Hoffmeister family, Grant thought his farm near St. Louis included land owned by Christian Hoffmeister. The matter was settled through a court battle in the 1870's.
We'd love to learn about the mysteries in your family history, write up the article and email a word document to firstname.lastname@example.org. It is a great way to make your accomplishments or brick walls accessible to others who might be researching the same families. They don't have to be Collin County residents, we'll even include yankees.