I am not a lawyer either, but you can't will to anyone what you don't own, and Melissa did not own Edgecliff... she didn't hold title on it, the bank does, because she has a large mortgage on it, and the G's are trying to claim they have a share in the residue of the money that will be the difference of what is owed to the bank and what can be realised on the sale of the property..
The Gs do not want the place sold, from what I gather, they want to know the Valuator's General price the place was valued at so they can put into process borrowing the residue of their original $1 mill, ( which they hope the court will award them, and I doubt the court will, but hey...) the money someone believes Melissa put into the property ( and for which their isn't much record off, ) and what price the Valuator says it should be.
The court is not releasing , to the G's, the Valuators price. For obvious reasons.