Responses
I get you trying to give other perspectives but if your dad had an omega locked in a room that he brings other alphas too would you really thing your dad was cheated on? Like yea Parent's wrong doings shouldn't fall unto their children but when a child takes on their parent's sins that becomes a different case. We don't know what the man is up to but it doesn't seem to be with good intent so.
The question is if he knows. He wont be that rude he knows or if he did and then still acted like that, then hes the problem.
I mean, if you think it in the other way, the omega may have been in a relationship with an alpha and despite being paired, he got cheated on. On the other hand, the alpha- might think that this omega (mc) seduced his dad and told him about being fated pair, kinda old alpha manipulated the information.