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It wasn't difficult to help his Senior Disciples to reincarnate.
The moment Raven returned to the Grand Ancestral Place, he already sent their souls to their chosen family, fusing them into an unborn embryo. There they enterer a rather peaceful slumber, they'll regain the clarity of their consciousness once they were born in this world.
Surprisingly though, all of eight of them chose their parents to be a regular mortal couple. In fact the 1st, 2nd, and 5th chose farmers as their parents. Raven had nothing to say against this, after all it was their choice. He was in no position to ask why since he knew they had a reason for doing so.
After assisting them, all he needed to do was wait. Before he leaves for the Divine Realm once more, they all should've grown up.