Disputing Wills Mental Capacity

Summary

The user is questioning the validity of his grandfathers will, suspecting that his grandfather lacked mental capacity when signing it. The grandfather had ALS and was in the hospital at the time of signing. The will assigned Attorney Johnson as the co-executor, who now receives a percentage from all the assets that will be sold. The user is advised to contact the local probate court in Nantucket, Massachusetts for dispute procedures. The user is also informed that a conflict of interest may invalidate a will in Massachusetts.

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My grandfather died. In his will, he assigned Attorney Johnson as the co-executor. I believe that my grandfather was not mentally capacitated when he signed the document. How can I dispute this document?
What evidence do you have to support your claim about your grandfather's mental capacity at the time of signing the will?
He had ALS. He was in the hospital the time he signed the document. He could barely speak. His doctor and assigned medical staff can testify on his condition.
Did your grandfather have a legal representative present when he signed the document?

General Information:
- In most states, proving lack of mental capacity can invalidate a will.
- Contact your local probate court for dispute procedures.
No, only he and Attorney Johnson were present.
Did Attorney Johnson have any personal interest or gain from the will?

General Information:
- If so, it could be a conflict of interest, which may invalidate the will.
- Contact your local probate court for further assistance.
Yes. He now receives a percentage from all the assets that will be sold.
What is your location? This will help me provide you with the contact details of your local probate court.
Massachusets
What is the city in Massachusetts where you are located? This will help me provide you with the contact details of your local probate court.
Nantucket
What is the nature of the relationship between your grandfather and Attorney Johnson prior to the signing of the will?

General Information:
- Massachusetts law requires the testator to be of sound mind when signing a will.
- Nantucket Probate Court: * Broad St, Nantucket, MA *, Phone: (*) *-*.
He has been his attorney for over 40 years/.
Did Attorney Johnson ever act as a personal friend or confidant to your grandfather, outside of their professional relationship?
Yes
General Information:
- In Massachusetts, a conflict of interest may invalidate a will.
- Contact Nantucket Probate Court: * Broad St, Nantucket, MA *, Phone: (*) *-*.