My mother passed away April 6th. One of my cars from high school was still in her name because it was taken off the road back around 96,

I have at least two other cars I want to do before that one, how do I tittle it? If I tittle it are they gonna have a problem since its been unregistered so long?

Can I just tittle it and leave it sit as it has been for years without doing anything else to it?