My cousin got my Dad, not mentally aware, to sign a sizable amount of money after his death. What action can I take?

Did dad have a will? Was the notarized statement witnessed? Do you know the witnesses? If it wasn't witnessed, there's a good possibility you have something to work with . . . especially with you saying he wasn't competent at the time.

*Shaking Head* -- there sure are thieves out there ready to take advantage of old people. Bums, all of 'em.

You need to see an elder care attorney. Before you go, write out the facts and gather the supporting documentation about your dad's mental state at the time the "contract" was notarized. Most first-time consultations are free...so look for one of those. The attorney can advise you whether you stand a chance of reversing the contract. If it was me, I'd probably go to a couple or three attorneys to get their take on what you can do.

For about a month, But she had a notarized statement giving her, the reminding money in the Bank. $69,000.

So, your father as died, your cousin has come forward with contract promising him a sum of money after your father's passing. You and other relatives are questioning the validity of that contract. Is that the situation? You will need a lawyer.

Does the contract spell out what this money is for? For example, was your cousin taking care of your father?

No

Is your father still living?