I have quite a bit on the family while they were in Henry County, TN, and a bit on some members after they migrated, and I'll share anything that I have with you. Some of the family still resides in Henry County, and, although I have found no connection to Ivan's family, a descendant who was a friend of my family, said that she always thought we were related. Our families certainly knew each other from about 1840 onward.
My e-mail, as shown on here, is incorrect, but I'll email you the name and address of a descendant of Ivan L. Jr (and Ivan Francis, I believe). I'm not certain that he would want it posted to the public in open form. It may be a couple of days before I get the email to you because we are trying to get ready for guests.