In Florida, to get temporary custody, you must be an adult or emancipated minor. You must also be an extended family member or a step-parent of the child. An extended family member is someone who is related to the child by blood or marriage. An extended family member includes only niece or nephew, brother or sister,
uncle or aunt, first cousin, great uncle or great aunt, grandparent, great grandparent, or great great grandparent.
In Florida, to start with, you'd need to become a guardian for the child. A person is qualified to serve as a guardian in Florida if he or she:
Is over the age of 18 years of age;
and Is a Florida resident
I'm assuming you're a Florida resident? If not, there are still other ways but please let me know.
A person seeking guardianship can file three documents: a Petition to Determine Incapacity, which establishes that the ward needs a guardian; a Petition for Appointment of Guardian, which asks the court to appoint a guardian; and an Application for Appointment as Guardian, which asks the court to appoint you as the guardian.
Since this is a court petition, you'll want to have a family lawyer help you with this. I can send you a list of family lawyers if you want.
The first step is guardianship and eventually you can go for adoption. Guardianship can be a complicated legal process, and you may find it helpful to consult with an experienced family law attorney in Florida. Just let me know if you need a list of names of lawyers in your area and I'll submit a link to that here.