If it was me, I'd just walk away. This is one of those things I refuse to do. I will not argue with sibilings/aunts/uncles/parents/friends about money.
If somebody wants this so bad, let them have it. My life isn't worth that kind of stress, I don't need money bad enough to fight somebody over it.
My attitude in life is:
1. Today I am happy.
2. When I get property/money that I didn't earn, that somebody else feels they have claim to. (ie. lottery/inheritance/whatever)
3. If it causes me stress and unhappiness.
4. Give it back, give it away, get rid of it.
5. Return to state 1. Today I am happy.
It doesn't matter what is given and how "right" I am about it should be mine, there is nothing material that you could give me that I would be willing to "fight" and "stress" over. Material goods are just that, material goods. They aren't worth it.
You won't live long enough to spend even two months over this issue, let alone the years its going to burn out of your life.
Two months is about the amount of time I would spend trying to come up with a reasonable solution to something like this, and get everybody happy. Once I crossed that threshold, I'd just say... "Thanks, but no thanks. Since it means so much to you, I don't want X, you can have it. All of it. Do whatever you want with it, but I'm not going to fight over it. I have a life to live. I'm gonna go Mountain Biking, see ya when I get back". Then go back to doing whatever I was doing before my life was interrupted by something that has "baggage" attached.
But thats just me, I know I'm strange. I am close to FI, so I know that impacts my thinking process somewhat on these types of issues. I know what its like to have alot of money. I see that it makes life easier to a point, but it can't make you happy. Happy comes from somewhere else.
laters,
-d.