You need to see a Real Estate Attorney for Legal Advice.
Have the Attorney review the Mortgage, the Deed, and the other Legal Documents to ascertain what needs to be done.
A change of ownership may trigger a Due on Sale Clause in the Mortgage.
In many States, a change of ownership may also incur Transfer Fee Taxes, Documentary Stamp Taxes, and other Taxes and Fees.
Again, see a Real Estate Attorney.
Best wishes to you,