It appears that XTO (Exxon) began producing Haley-Garland Allocation 8 well (RRC 08-48520) in May 2016. This horizontal well was drilled from middle of Section 8 through all of Section 5. Are you on pay in this well? If not, you are due back royalties. XTO may claim that it is still working on title and be holding funds in suspense. Or maybe your division order was lost. There also seem to be a number of new horizontal well permits in this area by other companies. This is likely why you are getting pressure to sell. To trace title, use tx.countygovernmentrecords.com for recorded deeds, probate, leases etc. If this is an old lease, it could be in name of other relatives from whom it was inherited. Use advanced search for a part of name with relative as grantor. You can preview for free and purchase for $1 per page. Do not use Microsoft Edge as you will not be able to enlarge pages for reading. Use Chrome or Mozilla or other browser. Or ask Exxon or XTO for lease info - date, lessor, lessee, recording volume and page.