Removed from ownership of oil rights without permission

I think I was unknowingly removed from deceased parents’ oil wells and mineral rights in Arkansas by my estranged, older brothers. Either that, or they simply are not sending any pay outs, perhaps they are not producing. They may have been sold too, but this is also unknown. One brother always handled them, and I only know the four counties they were located in. My dad made me memorize the counties as a little kid. Can I find the properties/rights using previous ownership names and who owns them now and sold dates if applicable? Yes, it is a very difficult relationship. If there is any recourse, I would truly like to a lawyer/mediator, as they are very intimidating. Thank you.