The Supreme Elder knew that Absolute-Formation had once been greatly shaken. Her parents were cultivators of the Extreme Formation Sect and had both reached the Immortality Regainment Realm.
In their Extreme Formation Sect, there was an unwritten rule that everyone followed: one's own children should not be taken as disciples.
The reasons were many. After all, many times it's hard to be strict in teaching one's own child, and everyone harbors the thought of suffering from inequality rather than scarcity.
The Extreme Formation Sect is a great teaching of formation cultivation, requiring especially abundant resources. If one were to take their own child as a disciple and then give more resources to their child, what would other disciples think?
Also, when teaching, would other disciples feel that you are hiding knowledge?
If their child takes another as a master, then there is no issue.
