A bit of backstory first.
My MIL has ME and a very hard time with her memory, therefore she can't really be trusted with her money. Normally FIL deals with the money, but she has told me and my husband that she thinks he took her money and used it for something else. When she has asked him about he says that he took it out of her account and put it somewhere safe. She has a small eBay business set up and uses that bank account for her paypal. My husband offered for us to open up an account for her, but keep it secret from FIL so she can save up money and use for holiday/spending money. I don't think she will be able to get a bank account because of her poor credit, so my husband thought we could open the account in our name, but it would obviously be her account.
I'm not sure how I feel about this. I thought I would ask if anyone knows about the legalities of it. Is there anything that we should consider before doing this? Can anyone see any problems or any benefits to doing it this way? I just want to make sure we are more knowledgable before we go ahead to do this. Thanks.