They said it’s because of the connection. The translation is a little wonky. I don’t know if it was even translated or if it’s just the way they were speaking about things. I also felt like there was space missing like there should’ve been extra panels in front of a certain things to explain things better.
But what I got out of it was that they have to use family members because they’re the ones that get the 50-50 connection because the ones that are transformed can exactly have their mental state most likely and family members are the only ones that can have the 50-50 connection probably I also think it’s most likely because of a mutation my theory so far is that this is man-made. They’re not exactly aliens. Those things were all made by the government became all sorts of monsters, and they kept going to make different ones to try to stop them and those like the sister become the monsters at one point for the continuous cycle also the name is kind of a giveaway. It makes me feel like a freaking Nazi name.

How exactly was she made into a hybrid and why was she used? Do they use relatives?