To see if an Oklahoma Quiet Title Action has been filed. Search here: OSCN.Net Input your, your sibling’s your mother’s name, and your uncle’s names for quiet titles and probates.
If you were not noticed in the ND case you may be able to challenge even if a judgment has been entered. This would require visiting with a ND attorney.
OKCountyRecords.com will only covery about 65 counties. A handful are provide searches using different platforms. Some like Grady & Tulsa County require a subscription. Oklahoma County Land Records Online Search