"They were dressed in black, all had masks on, and all had gloves on," Deputy Nick Mahoney told reporters.
The intruders - who police say were armed with brass knuckles and a knife - were shot by a 23-year-old man in an act of "self-defence", officers said.
The son may not face charges due to so-called stand your ground laws.
"This may be a case of 'stand-your-ground,' however, it's still too early to say for sure, and we're still looking into all aspects of this," Mr Mahoney told local media.
