Florida Juvenile Procedure Rule 8.710
(a) Definitions. For the purpose of these rules the terms
“party” and “parties” shall include the petitioner, the child, the
parent, the guardian ad litem where appointed, the custodian, and
every person upon whom service of summons is required by law.
(b) Other Parties. The state attorney’s office or the
Department of Children and Family Services may become a party
upon notice to all other parties and notice to the court. The court
may add additional parties.