Regarding the twin goddesses Vohl and Vahl, having read this chapter in Japanese I'm pretty sure that part was misinterpreted by the translator. They are not daughters of Origin, but elder sisters of Origin herself. The original Japanese reads: それが双女神ヴォールとヴァール、かーさまの双子のお姉さま達です。which translates roughly to: "They are the twin goddesses Vohl and Vahl, Mother's twin elder sisters." When Origin is speaking with Ellen in her room, she also refers to Vohl as Onee-sama, which would be weird when referring to your own child. So they are actually aunts of Ellen, not her sisters.