"Something within Jason seals his bloodline, and he has no idea what exactly it is. Apparently, it has to do with his mother, but that doesn't make sense to me….
He doesn't even know what kind of race the Celestias are either..."
Wisse simply exposed everything Jason had told him in secret without caring about anything, but that was exactly what Jason had expected.
Since Wisse had mentioned his master, Jason was fully aware that Wisse didn't have the authority to make his own decision.
This was only logical because every being below the age of 50 was seen as a youngling, and that was according to the common race's perspective.
Higher ranked races had probably an ever higher age limit to decide whether someone was still a child or had already matured.
In the end, this didn't matter, and it was only Wisse's helplessness that had caused Jason to smile when he had left the apartment.