The series is too cute 'cause of the siblings! Though, everyone besides them seem annoying. I know they still have royal blood blessed by the Gods, but they are expecting so much while scorning them for being lowly. They're all trash in my book - even that brother that gave them a 'gift'. He wasn't interested and says that to their face? Moreover, he is lacking in common sense. Who grabs a child by the arm? If they were normal children they would, indeed, have gone crazy.
But the manifestation...will they also grow older quickly even with being a half-blood? It wasn't that clear.