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My condolences on the loss of your father. This is a bad situation as it has shifted the burden on you and your siblings to bring an action in the probate court to prove that the intent of your father was not to have everything pass to the one sibling. However, by naming her as joint owner on the accounts, by operation of law she is the owner of all the accounts and until a probate is open and an attempt to undue the assignment of her a joint owner there is no legal means to prevent her from spending everything.
If the making of her being joint owner can be undone, then each sibling would take 1/5 each of the entire estate. But for that do occur it must be proven that the intent of your father was not to have her keep everything and the fact he was undue influenced by her near his death.
I am very sorry this is happening to your family and the fact I have to be the messenger of not so good news. My suggestion is to retain a local attorney where your father lived as soon as possible and begin the process of unwinding the making of her co-owner.
All my best & encouragement.
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