Transfer of mineral ownership upon death of parents

I have a similar issue/question… Parents deeded property December 1946 as follows:

…NW quarter of NW quarter of Section 33 Township Six, Range Six containing forty acres more or less according to the recorded plat Grady County, Chickasha, Oklahoma.

Any suggestions for qualified lawyer? Landman? The Parnell Family inherited other land parcels in that timeframe. Some parcels are under active drilling now. Can’t do too much searching as a novice. Needing advice and honesty.