In FL grandparents have no independent timesharing and/or "custody" rights. In order for your son to give you the legal permission to be the child's custodian, the child's mother needs to give permission as well. See below several links to helpful forms.
http://www.flcourts.org/core/fileparse.php/533/urlt/970a.pdf
http://www.flcourts.org/core/fileparse.php/533/urlt/970b.pdf
Best of Luck,
Helena Y. Farber, Esq. ~Associate Attorney~
Law Office of Cindy S. Vova, P.A.
www.vovalaw.com
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