Financing questions

Hello dear people, the reason why I’m addressing you is not really nicer. My father had financed an Arona in the summer of 2018 with a graduation rate. He also brought the KSB with him. Unfortunately, my father suddenly passed away the week. I rolled through the Internet during the nights and received various answers to my questions. Maybe one of you could already gain experience with the KSB and a death. Andersrum stands on other sides of the KSB also for the closing rate. My mother unfortunately has no driver’s license and would give the car to the daughter-in-law. Would there be problems there on the part of the bank? Or does the bank send the letter to her unreservedly and then she can do with the car what she wants?