Ok so remember how in the original novel Eirin was kicked out of the house(not recognized by the Etam members) but it was just a whole another misunderstanding??? But then the 2nd time she came here the misunderstanding was resolved and she is loved? So I think your theory is 100% upto the mark and that once she reaches an ending here she will have an enlightenment or realization that her family here and there are the same????
But I remember reading some spoilers and when she wakes up again
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Dad erno would come with her and punished her og family in her behalf
Owwwie ,but her brothers there seemed nice so I thought it would follow the "I don't wanna be a magpie bridge'' plot, btw that's a great novel,I mean you can read the manhwa too but the novel's completed and I loved it
Why do I feel that it is just a misunderstanding in her part? And that her family now and her family in past life are the same, But just born at different times. Her twin siblings looks just like the ones in the past and in this latest chapter we can see that her sibs do care for her (still not a hundred percent proven). So, in my conclusion it's her misunderstanding like in another Manhwa where "Leon/Deon" the overpowered MC who changes attitude when drunk and is sickly at birth/childhood (sorry, I forgot the title is so I'll just define him?). And lastly, I am also sorry about my wrong grammar I'm not really good at English.