As much as I want that to happen, I can't imagine what their reaction would be to their beloved bloodline is actually Hera and how the story would continue onwards without the deceptively *sweet* family fluff. So far 90% of this is less around her revenge and more around how she's finally receiving love and affection with no expectations for anything from her. Destroying that would be just actively destroying the whole plot point.
Oooow- that's hurt! I still don't like that old man and his uncle, they're abandoned and neglected the real Sherina. I hope they'll know soon, that fact.