Is the estate responsible for a credit card debt even though another person was an authorized user on the account and made all of the charges?

Question Details: My siblings and I have been handling my dad's estate in probate without an attorney, as we are all on the same page and everything is going smoothly. We have done all that the probate court has asked. We have all final bill notices from all creditors. One of the creditors is Bank of America for a credit card account that has over 8k in charges. The bank told us my dad was the sole person on the account but he had another person listed as an authorized user of the account. This other person has their own card with their name on it and all the charges came from that guy's card. So is the estate responsible for paying that debt or legally can we make this guy responsible for it?

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