Does this help?
I found this at
http://ccrain.fl-dcf.org/documents/7/39.pdf#page=1
An occupied residence in which child care is regularly
provided for children from at least two unrelated families
and which receives a payment, fee, or grant for
any of the children receiving care, whether or not operated
for profit. (Section 402.302(7), Florida Statutes
Which doesn't say how many kids from one family just that you can't have kids from more than one family.