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Hey what if the father is of the same race as those entities which explains why our boy can sense his kin/kin power* just after removing one curse and it could also be the reason why he had to leave them as he was discovered living in lower planet/realm by those beings and then suddenly they thought of taking over the planet after having him separate from his family
I going to assume his father was someone important like a runaway prince or high a Noble, he can even be a illegitimate child. And while his sister wasn't born with mana he was and a lot of it so his father sealed. Or it has something to due with him being able to sense the evil being in people and his father wanted to protect him because kid can't keep their mouth shut about see different stuff. If you get what I'm saying