Rebecca Elvira Halford Crockett of TN and TX

I am looking for anyone whom has info on Davy Crockett's daughter, Rebbecca Elvira. In particular, I am looking for any info or research on her 2nd husband, Reverand James Marion Halford and any of their children. I have some info but, specifically, am looking for info on their children. Any help in this regards will be greatly appreciated. KLong