TenisDaze is correct. It sounds like a title dispute issue. Typically these require a probate to resolve. Sometimes a quiet title action. You probably cannot recover the lease bonuses paid to “pretenders” because these took no property from you. However you should be able to recover any royalties paid if these were your minerals.
Any recourse for RD Williams and XTO?
Yes for your share of royalties. They may be in suspense or improperly paid to someone without title.
Visit with an attorney who can review the information.