Hi Yogie, probably there will be some back payment for royalties. However, I think legally it is the duty of the heir of a mineral rights owner to notify the company, as well as Tyler County, of a change in ownership.
About the transfer from JB to another company, perhaps you can find that in the Tyler County records.
Go here and select Document inquiry. Best to use Internet Explorer. Then you can search for JB. If you want old documents, when you see Right Click on a button at the top right side of the screen, right click on it and it should download to your desktop the software to search the old documents database.
See if you can find some of your answers there.