I posted another question recently relating to the same person but I didn't want to include two questions in the same post.
My father is an extremely abusive person and has been physically, mentally, and emotionally abusive throughout my life. When I was in college, he came to my apartment and forced me to sign a "contract" in which I would be forced to pay him $30000. This contract was essentially me writing out "I promise to pay $30000" with my signature at the bottom. I told him numerous times I did not want to sign anything without a lawyer present, and he threatened to hit me if I did not sign it. I even tried telling him I would sign it if it included that he never contact me after college, but he cornered me and raised his fist up in an attempt to punch me.
That was 2 years ago, and he still has the contract and threatens to use it if I don't listen to him. Is there any way I can prove to someone that I was essentially forced to sign this contract, assuming he did try to use it?