Well, in the Alice in Wonderland story eating a bit made you grow big and drinking the potion made Alice shrink small. So several people theorized it wasn’t Henry Sr.’s heart in the box but a miniature Henry Sr. And Regina said the Queen of Hearts held him as collateral against her. I just thought for sure that looked sin=milar to Regina’s heart box vault and being in wonderland and the Queen of Hearts… so I’m having a hard time swallowing a miniature Henry Sr. myself, but I won’t discount it for lack of any other explanation. Although, I have to wonder who fed him and kept him alive? I don’t think a heart ate that piece of mushroom.
I will say, that with all the comments about family, at the beginning, I almost felt like Regina and Jefferson were somehow related and estranged. So it would be interesting to know how they knew each other, especially since he told his daughter he didn’t know her, which means he hadn’t seen her for quite some time, but obviously he knew her when they talked in the house and had some sort of history.