I'm really upset that Edora didn't react to being considered only a "sister" after the headpat... her reaction was portrayed much cuter in the novel, where she was shaking in despair at the stands upon realizing she's only considered a "sister" by the MC.
@hachimaaan
He never did in the manwah, but the siblings told their dad about him so it's presumed he already knows him.
@SaitoHimea
That's basically it. Well, daughter or any woman for that matter. He can pick as many of them to be his wife, but he needs to sleep with one woman from each family to produce an heir.