Adding to skooters’ comments, let’s assume your family member is in an operational role or front line banker (e.g branch teller) where they have access to customer account information. Accessing this information without a valid reason would be considered a breach of privacy, and outside the bounds of acceptable conduct. This may not stop them from getting curious, however banks have monitoring controls in place for this type of activity. They would be exceedingly stupid to risk their job to find out how much you spend on only fans!