Xie Na then went on: "And there is a strict rule of the tribe that they shan't marry an outsider, otherwise they will be stripped of their powers and banished to the tribe's prison. This is to stop the bloodline power of the tribe to not leak out and to stay within the tribe itself.
Since it was Uncle Wang Hu who came to take your mother then I guess, he must have promised the saint to keep the secrets of your birth a secret. In exchange for it, he must have asked for power in the tribe.
He must have threatened your mother and the Sovereign by using you as a threat.
Considering the powerful influence Uncle Wang Hu is having today, it must be because he used this very secret to his advantage.
His authority currently in the tribe is next to the Sovereign instead of your mother and is doing things there, however, he like.