If you see a red on anyone else besides a gracie...then they are full of shit so feel free to school them.
Only 9th and 10th Degrees are gracies (10th being helio) So technically if you feel like doing BJJ for another 75 years you might get 8th degree, but I highly doubt you would get 9th since those belts are only for the graices. Then again if you are good friends with them for 68 years and you've been training with them since you've had your white belt if they really really like you they might make an exception and if you earned it give you 9th dan but....i highly doubt that.