shouldn't you know which tribe you belong to, --?
That is another point. According to watchtower, the 12 tribes are all the humans with an Earthly Destiny*, the 144 000 are sealed out of them (of course, where else would they come from). but:
The sealing Angels are not telling. who are in the distinctive tribes, nor who gets the seal. (only his/ her hairdresser knows for sure).so,
Since the city with the gates will descended from heaven, it is obviously to let the earthly tribes in. (The city are [already] the 144 000, the bride) so:
* ALL JWs, should know by now what tribe they belong too. evidently the angels do, and they rank lower than the GB The anointed in Paul's day used to knows things that the angels longed to peer into.! Angels are not peers to the anointed?; really?!?! it really does not add up!.
Try those facts on your favoured elder, couched, framed in the right question.