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I agree with N+S_fan, the last two episodes apparently proved who isn't for sure the other Balcoin.
Faye is the only one who have tried everything to gain individual power, but she failed miserably even with help from outside.
Hoping that the writers will spare us any incest, the only two options left are Diana and Melissa. I was leaning toward the latter, but after the dress-on-fire little spell, there is a strong possibility that Diana is actually the other Balcoin. Since I love her relationship with Charles, IF she really is the other Balcoin, I hope that, as someone has already suggested, JB has/had a sister.
On the other hand the fact that the unknown guy saved Cassie AND Melissa might prove that he is someone who has a connection to both. So actually the last episode pointed towards both Diana and Melissa as the other Balcoin child.
I said "unknown" guy 'cause his boots are different from the ones Jake wears in the last scene of the episode, so...