im in the begining of a divorce (FL), have not secured and attorney. Wife says the children might not ever be mine, paternaty DNA requests in FL? how

  This is a complicated issue.  You would have to make a particular allegation (count) in the divorce petition to disestablish paternity.  However, courts will not always allow this, even if the children are not yours, depending on their ages and what relationship you have establsihed with them and whether someone else will "stand in your shoes."  (i.e.: the biological father)   In your petition ask for the paternity test, allege all the facts as to why you want it- as specifically as possible- and then  ask for a hearing on this issue before the judge by filing a separate Motion for Paternity test.  Again, this is very basic, and the facts of your case will more determine  whether the court will grant this.   Best of luck. Cindy S. Vova Law Offices of Cindy S. Vova, P.A. Broward/Boca Raton 954-316-3496/561-962-2785