Hi Jim! I'm a Colvin descendent from Unionville too. My great great grandfather built the old mercantile there from what I've been told. I'd love to learn more about your research! My email is firstname.lastname@example.org if you'd like to connect. I've been so curious about this part of my family genealogy and my dad has too. I sent him a link to your blog and he thinks you might have a son named Kirk from Prairieville that is currently his client (he is an architect)! Anyhow hope to hear from you soon!