Thinking of taking on a mortgage from a family member? Then you'll likely look into a mortgage assumption agreement.Requirements – NJSA A. 1. A cover sheet (or electronic synopsis). Ensure all necessary financial information is accurately provided. A mortgage assumption agreement is basically you coming in and saying sign this paperwork I'm still responsible for the mortgage. Your first step is to work through a mortgage loan documents checklist to gather the financial documents you'll need to get pre-approved for a home loan. A wraparound transaction is a form of creative seller financing that leaves the original loan and lien in place when a property is sold. Will make all payments under lhis Note in the form of cash, check or money order.