I am doing research on these families, also. Have heard that Jim and Raney Grigry are buried in an old cemetery at Marietta, Love County, OK. You have much more info than I do. Didn't know about the murder of Robert Isbell! Wish I had more to help you, but looks like you are way ahead of me. Don't know if I need all of the "tons" of info you mentioned. But am very interested in learning more. I do not have marriages yet either---
Thanks, Christy