Legal Question in Real Estate Law in Illinois

If you did not sign it and did not ratify it by your actions, it is not binding.

It is difficult to tell from your question, but did you sign some documents and not others, and someone forged the spots you did not sign? If so, there may be a good argument you are still bound by the agreement. You really need to discuss this with the attorney representing your in the transaction--and if you do not have one, you should hire one immediately.

Forgery doesn't automatically void a contract; but it is a possible defense if the seller tries to sue you for breach of contract. But you seem to admit you were "involved" which means it sounds like if things had not gone "bad" you might have been ok going ahead with the contract despite the forgery you claim. But you don't say how "involved". So if the seller is not willing to let things go on your claim of forgery, the seller might just sue you and things could get muddy. Time to think about getting a lawyer involved and fully explaining the situation to him or her. Good luck.