<prompt> Human: Hi everyone. My first time posting here so I hope its the right spot. My mother in law calls me yesterday and she says she got a bank statement and sees an account with a few thousand dollars in it but didnt know where it was from. I had her take a picture and send me the statement and it turns out to be an account my wife and I deposit our rainy day funds in. I had no idea why our account was there so I messaged Chase about it. A rep responded and said that it was because my wife is a cosigner in the checking account for my mother so they linked the two accounts together and that if I wanted to fix this issue, I would need to write a letter to request for the account to not be linked. Weve never ask for the linkage nor did I think they would ever link my account information to my mom-in-law. Can they do that? The statement showed my transactions and account number and I feel like it violates my privacy that they shared my account information.edit - Sorry if my original post was unclear. I was still quite upset when I wrote this. Ill provide some backstory. My wife and I opened a checking account to just save some money on the side. She is a joint-holder of the account, not a cosigner. Anyways, my MIL got her statement in the mail and it had my account information in it. Chase said that because my wife is a cosigner on my MILs account again, their wording, they linked my account with my MIL. My wife is actually a joint holder in that checking account as well, not a cosigner.  <response>: Close the account. Do no more business with Chase. The problem goes away. 