Thank you for the additional facts. If you need clarification of this answer, hit reply and ask a follow up question. I am happy to help. There are various ways to have a joint bank account. For example, if a person's name is XXXXX XXXXX bank account "for convenience only" then the money stays in the estate of the decedent and the other person on the joint bank account is not entitled to the money. If your Mother did not have capacity or you believe that your brother had undue influence over your Mother so to put his name on the bank account, then you would bring this to the attention of the Court through a motion and let the Court make a decision. Note, unlike in a divorce, the decedent could have deposited all the money in a bank account and upon death the other joint bank account holder could get the money. However, if it appears that the bank account was for convenience only, or there was a lack of capacity, or undue influence, then it could be argued that the money should stay in the estate. Note also, that either your brother or you have standing to petition the court to be the administrator. If you need clarification, hit reply and let me know. Otherwise, please provide a positive rating so I receive credit for the services I am providing you. Thank you.DamienBosco41100.4664564815