Repo'd car that was never taken?

My husband bought a car as a teenager. He was young and just wanted something that looked nice. The car only lasted about a year until it had major engine problems. It would have cost more to fix than the whole car was worth. So we chose to quit making payments and get another reliable car. This was nearly 10 yrs ago. It still shows up on our credit report but no longer damages the score (if that makes any sense) The bank did a "ride off" on it and never came to get it. Now it is just sitting at my mother in law's. What can we do with it? Legally can we sell it or have it towed to the junk yard?