Everything I know is an accumulation of information from my mom, who is part of the Calhoun line, and the internet. Here are some links I've used and I will get in touch with my mom about more Calhoun information.
Also, I have some photos of the family if you are interested, and one I've posted on here already as I'm trying to find out more about the house, since it was supposedly still in existence about 15 or so years ago. The link for that is: http://genforum.genealogy.com/calhoun/messages/3498.htmlhttp://genforum.genealogy.com/calhoun/messages/3498.html and the photo is posted as a follow-up message.
There's mention of a William Calhoun (not part of my particular branch) on this site: http://www.mylouisianagenealogy.com/la-county-grant.htmlhttp://www.mylouisianagenealogy.com/la-county-grant.htmlScroll down to the bottom of the site and read about Colfax. There is more information about him a bit further down.
Either I or my mom will send more info about the family tree to your email.