The bodies were discovered by police on Sunday morning, and 17-year-old Tyler Hadley is charged with two counts of first-degree murder.
Police believe the adults were struck on their heads and torsos the previous day sometime after their son posted on Facebook to tell friends about the party.
Investigators believe Blake and Mary-Jo Hadley were attacked outside their master bedroom and the bodies were moved into the bedroom and the door locked.
As many as 60 people attended the party Saturday in the community about 50 miles north of West Palm Beach, according to Port St Lucie Police spokesman Tom Nichols.
They were loud enough to prompt a noise complaint and a visit by police officers. When they arrived at 1.30am on Sunday to warn about the noise, the party was already breaking up, Mr Nichols said.
Then, police said, they received a tip that a murder may have taken place. They returned to the home at 4.20 am, finding the bodies covered with towels, files, books and other household items, and the hammer between them.
The mother, 47, was a school teacher. The father, 54, worked for Florida Power and Light.
Police said they believed they died of blunt-force trauma.
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