Tasha
This is when a great Realtor would be invaluable. I can give you advice, but what you really need is an expert that knows three things - your local market trends and values, your property, and your situation. I would be happy to refer you to a top Realtor in your area to help you.

For payments of a mortgage to be assigned, that is called "assumable" that those mortgages are rare. Most mortgages have a "due on sale clause" which means that they must be paid off if the property changes owners.

The reason that I recommend talking with a local Realtor is that you need to know your options. They can analyze your situation and offer you choices, and with each choice their are consequences, so you need to weigh the costs and benefits of each choice.

Good luck, and Merry Christmas~!