report it to the police. they can investigate and review the signature!
In accordance with the Avvo community guidelines, this communication does not constitute "legal advice", nor does it form an attorney-client relationship. You should seek counsel in your geographic area regarding any specific questions.
Your question raises more questions than can even be answered here. Please either report this to the police or seek advice of a qualified criminal defense attorney if you believe you may be responsibility in the forgery or fraud.