Can a bank share a client's financial information with another person?

Question Details: My husband, sister, brother in law and I owned rental property together through an LLC. When we sold the property, the bank gave my sister and brother-in-law, who has power of attorney, our financial information that we shared with the bank to get approval for a loan. We were not aware that the bank was going to share this information. We had provided it but it was confidential. Now my sister and her husband know our financial status and we are very upset about this. Is this practice against the law?

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