I purchased a book online entitled "The Sydnor Family Saga" written by Sydnor Thompson, Jr. His research covers the Sydnors beginning with Fortunatus Sydnor (1640-1682) and his descendants. The Sydnors from Halifax County, VA who moved to MO are in that book. I think it would be helpful for you. I purchased 2 books - one on Ebay and the other directly from Sydnor Thompson. I just searched for him by name. Hope this helps.