It's theory time!
This theory is based on the "bad" ending of the Elizabeth storyline
What happened to Elizabeth's father and some idk
We all know that Elizabeth's mother is harsh, cold, demanding and have high expectations for her and specifically want the girl to do the trial since she failed and have Elizabeth.
In the "bad" ending, it is said that after doing the union of flesh. Elizabeth become just like her mother or something and is pregnant with Arthur child.
In the end, the question is: would the cycle repeat itself?
Now we all know that the trial required both male and female to goes in together so.
What if Elizabeth's mother did the same and also done the union of the flesh and got impregnated by Elizabeth's father.
For the entire game, we never see any other male other than Arthur himself and Elizabeth's mom always threaten Elizabeth with reporting Arthur as a man to the elven and who knows.
What happened to Elizabeth's father? Most definitely in my theory is that he was taken by the elf and got lock up or experimented on or executed
But why would Elizabeth's mom threaten to do such things to Arthur if she had been in Elizabeth's position before?
The trial changed her of course.
Well that's my theory