I believe they are sisters but not twins. The mom is insane and refused to believe Helga was her daughter even though she is. I believe that's what I was told.
! Spoiler!
... Iirc, they are twins but their mother is the maid not the duchess.
What??? O-o
I heard they were twins born to the maid. The Duchess' child didn't survive for some reason and she went crazy so they used the twins to spin a tale of Switched at birth to stabilize her
I honestly don't get how people don't question that they are identical. Can you have two identical daughters of the same age from 2 different mothers? It isn't like the girls are clones of the Duke. The only way their looks can be so much alike is if they are full sibs
True true
*spoiler* (maybe)
Is it true that the fl is actually the long lost twin of the real daughter??