A family member lent me money and used stock to cover the loan. They have asked me to sign an agreement to pay back the money with my part of a shared inheritance (when the death of the party occurs). I do owe the money, but the form that I am asked to sign was witnessed by the partner of family member. Is this legal? Also included is naming the family member as a beneficiary in my will, binding agreements on both heirs, and agreeing to pay the family member if I sell anything or win the lottery. Biggest question is the witness, next biggest is should I sign this with all the extras included?