Responses
Well for one it is pretty common for kids that age to think they would marry one of their parents... And that always makes the other parent the rival,but there is no deep meaning to that because they will grow out of it soon.
And for the Alpha_Omega-Thing I think they need to know and understand it (seeing where they live and so on...) and also to understand what that means....
(And I think he is happy that his kids are Alphas, because he doesn't want them to suffer...)
Um, he let's them call their father their rival and doesn't stop the alpha omega talk.... why doesn't he clear it as that is their 'mother'. not sure if that is the right term, but he gave birth to them.