they showed Hanyuu's daughter in the last season (ok it wasn't a real season but whatever) and she looks just like Rika......so who is this Oyashiro-sama?
Oyashiro is Hanyuu's daughter. She killed Hanyuu, because she asked, and then created the furude family. See Higurashi Rei for more detail. So Hanyuu is Rika's grandgrandgrandgrandmothern or some shit like this.
its more of retroactively making her Hanyuu's daughter, because this character was created before any of that information came along
This plum kelp tea is quite good.Isn't it? You're quite a chic person yourself.Yai! Beatrice, I challenge you!And if I win, give me the magic of "Making Unlimited Pastries".Don't get too close.Rika! What are you doing here?!Wait! Why have you two come to this world?!And don't call me Rika!Anyway, is it really OK to be dismantling her?It's fine, she's more tenacious than a cockroach.She'll be cured if we just gather the pieces and use some gum syrup.Oyashiro Door