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Dear Mr. Goforth,
Thank you for posting your request on History Hub!
We suggest that you begin by reviewing the information on the Bureau of Indian Affairs and the National Archives (NARA) websites. If your family was from Oklahoma, FamilySearch.org maybe include the information you seek on your great-grandfather. Otherwise, please check the various rolls that are available on ancestry.com. Please note that if your family left the reservation, they will not have been noted on those rolls and there will be no way to officially show tribal affiliation.
We hope this is helpful. Best of luck with your family research!
[Information provided by Cody White, Subject Matter Expert]