If you send your information to the Choctaw Nation for your CDIB, they will figure your blood quantam. They will divide each generation by 1/2 and that is what will be on your CDIB card. If you have Choctaw on both sides of your ancestory, then once each side is divided in half for each generation, the two sides are then added together to get your total blood quantam. FB Grandma FB Grandpa 1/2 Mom 1/2 Father 1/4 You 1/4 You 1/4 + 1/4 = 1/2 Your total quantam Hope this makes sense. Shelley