There was no census in 1812. The census records are every 10 years, there are tax lists only. Locating a copy of David's will is possible the only way you'll be able to locate the children. You might check Washington Co., TN for records. I can't remember offhand when that area went from Washington Co., VA to Washington Co., TN. It was also known as the Watagua area. Good Hunting. Patti