How can you prove your deceased father an alcoholic diagnosed with cancer did not have the presence of mind to make a will?

Answer 1

You could start by speaking to his doctor to see if the doctor could write an affidavit stating his opinion of your father's legal capacity at the time he wrote the will. You could speak to friends, family members and neighbors to see if anyone believes and is willing to testify in court that your father no longer had an intellectual grasp on what he owned, what would happen to his property when he died and if he could easily identify his children. See the link provided below.