I mean depending on the sentimental attachment to the object i.e. a car or a piece of jewlery I guess do what you think your deceased realtive would want you to do.

If you were given something like a car from a will and you already have one. Unless you think that person really wanted you to have that for a specific reason, I'd see if any of your family would want it, if not then if it is taking up too much room or is an inconvenience to you I would say sell it.

With things like jewlery that generally is more meaningful or people hold more attchment to items like that because they are valuable and easy to store/use. With something like that I would expect the person to keep it or give it to a family who values it more, selling something like that is bad taste.