Yes, I was accepting that on the record of Emma's marriage, the person listed as her mather was Aron's wife.
And the person listed as father was probably the Edward who was Aron's brother, Edward.
Whether open marriage or rape, no idea.
It is my understanding that such happens.
You seem to be ignoring the fact that a child born to a married woman is legally the child of her husband, regardless of who the biological father is.
You also seem to think the fact that she is listed among their children on the Censuses and Manifest means it "has been obscured for 20 odd years at least if not down right hidden" whereas I think it might well have been openly known or alternately, it may have been known within the family, but not as openly in the community. Either way, nobody saw any reason to make an issue of it when giving info for such forms.
Legally, she was Aron's child, she was Therese's child, she was living with the family. Why should they not just list her among their children on such forms?
I have friends who had been married for over 15 years when the husband told me, don't congratulate me on this child [...] Is expecting, it isn't mine. But all three adults continued to live in the same household for a good bit longer.
in that case she eventually ended up with the father of that child, but I have no trouble imagining in other cases the original husband and wife might have resumed their relationship, and if so almost certainly would not have gone into detail when filling out a Census or etc.
If the Marriage record info was given by Ernst, he would not have known what was on the Manifest or Censuses. Even Emma likely would not have.
If I had thought it was 100% certain that she was fathered by Aron's brother Edward, I would not have started this discussion.
But I definitely do not share your views, and find myself reacting against them to the point I have difficulty reminding myself that just because you are wrong about how certain and obvious it is that Edward is not Emma's biological father does not mean it is proven that Edward is her biological father.