My issue with the theory though is that if Princess Eva is the sister of Prince Henry, that would mean Prince Henry is also Cora’s half-brother by sharing the same father, King Xavier. Yet, I believe Cora’s love interest is supposed to be Prince Henry, so that would be incestuous, even if she didn’t know he was her half-brother. Yikes! I don’t think Disney would let Adam and Eddy go that far on a family show
They weren’t saying that Henry was Eva’s brother, only that Eva and Cora share the same father. I think Henry is just some poor dope that the miller arranged to marry Cora.