So sorry to hear about your situation. You stated "contracts have been signed", not sure if you have accepted an offer on your home, or if you are referring to signing a listing agreement. I am not an attorney and must tell you that I cannot give legal advice, however, from the veribage of the document the broker is asking you to sign, I would definitely consult with a real estate attorney in your area before signing it. Especially if you have accepted an offer on your home, there may be other legal ramifications from the actions or inactions of your realtor that you are not aware of, which a real estate attorney could advise you on. Good luck.