1. Read the agreement carefully to understand the obligations. Thinking of taking on a mortgage from a family member?Then you'll likely look into a mortgage assumption agreement. This mortgage assumption agreement allows a new borrower ("Borrower") to assume an existing mortgage from the original borrower. Requirements – NJSA A. 1. A cover sheet (or electronic synopsis). A loan assumption agreement allows them to understand what is expected from them and ensures that they are aware of their rights and legal responsibilities. Log in to your Freedom Mortgage account.