In Florida, a 17-year-old who has a GED is considered to be an emancipated minor and has the same legal rights as an adult. This means that they can move out of their parents' home without their permission and can also get married or have children.
The father of the child, who is 18 and has a job, is also an adult and can therefore make his own decisions about where he lives. He does not need the permission of his parents or the 17-year-old's parents to move in with her.