is it possible that the Queen of hearts and regina could be sisters?

it suddenly occured to me that while i was remembering đọc people's theories on how jefferson and regina could be siblings hoặc the Queen of hearts could be cora, etc, i was thinking if it could be possible that regina could possibly be sisters with the Queen of hearts. i believe cora is dead cause regina killed her and took her powers and the Queen of hearts has a vault, kho tiền of hearts just like regina's so i'm wondering if she and regina could be related somehow. i know as of now, we believe regina is an only child but i'm very curious if it's any possibility that she's secretly sisters with the Queen of hearts. maybe she lấy trộm, đánh cắp henry the father away so she could have their dad around her instead of regina having him around. is this theory in any way possible?