Determining Heirship

I was contacted by Triangle Oil saying that they need to determine heirship of my grandmother’s mineral rights in Harrison County that are being managed by Comstock oil. They asked me to send copies of my grandmother’s trust documents in October 202,which I did. It is now January 2023. I have emailed both Comstock and Triangle asking what the hold up is. They just say they’re figuring it out and will let me know. Is it unusual for a landman and the attorneys to take this long to draft an affidavit. Should I look for a mineral rights lawyer?