Can someone who was a joint account holder on my mother's bank account take all the money in the account after her death?

Question Details: When my mother was living she made my nephew a joint account holder on her bank accounts with the intention that he could pay her bills and keep her affairs while she was alive. It was never her intention to make him a joint owner of her accounts but she signed the bank papers. She had a will that left her home and half of her financial estate to me as her only living child. The other half of her financial estate was to be divided equally amongst my sister's 4 children. It seems to me that since my nephew was made a joint holder of my mother's account he could legally spend that money and disburse the funds as he sees fit and there would be nothing I could do. Am I correct?

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