She always wanted me and my brother to log about 100 acres and give her a proper burial/funeral, set up a trust for future taxes and trust for my uncle who is also on the deed, and divide the rest between me and my brother since our mother died. She wanted this in case she became incompetent or was a security for us in case it was lost in probate court or to the medical bills. I have 4 witnesses but no documentation though. She has no Durable power of attorney or Power of Attorney set in place and is now mentally incompetent.
I am assuming she has no will. Then she dies without one. Then probate will have to assign someone Administrator to handle the estate. When it comes down to it, your Uncle will inherit as her only living child. I don't think there is a trickle down to grandchildren unless stipulated in a will.
I too suggest a lawyer. Maybe he can find a loop hole.
As for your Grandmother, as others had mentioned, time to make an appointment with an Elder Law attorney, as everything is so very complex.