The story of parents finding out their toddler son may be the reincarnation of a Buddhist priest has effective elements but strains credibility.
If this father is so religious, why is he in the States owning a restaurant? Nothing wrong with any of that— but motivations should be made known. Yes, the mother is studying Buddhism, but this is her child. It is hard to believe that she could agree to this radical separation from her own toddler.
But then thought, maybe the playwright is making a political or social statement, something along the lines of all children who are recruited by monasteries somehow being puppets of that religious system and the parents who seek social status by having their children deemed special by these Buddhist priests and leaders.