Unfortunately, yes. Pheromone shock. Years later when he finally gets to see everyone at his sister's birthday party he's treated as an unwelcome outsider.
Yea I don't think it was specifically mentioned even in the novel but it was implied, yes
He was indeed the one hurting them but this is all because of his pos father.
His sister and him had actually the same condition but the dad medicated her early on to make her their pack leader whereas he left ML suffer from his condition all those year to make him the pack supervisor
But if I remember correctly wasn’t he the one hurting his siblings? It’s been so long since I read the novel though. He’d forget after doing it tho