I just found out that my ex-husband forged my name on a quitclaim deed and his mother was the notary wanted to know what I can do?

Yes, you can start by filing a complaint with the law enforcement agency where the fraud (i.e., forgery, non-compliant notarization, and illegal transfer of your house) occurred.  If it's within city limits, contact your local police department.  If it's in the unincorporated area of the county, contact your Sheriff's Office.  You, also, can file a complaint with the Florida Secretary of State's Office against your mother-in-law since I believe the rules still prohibit her from notarizing her own son's signature.  Additionally, you should notify your local clerk's office and tax assessor's office of the fraud.  You also should consult with a civil attorney regarding your legal civil options.