Kelly Preston and John Travolta

John Travolta and Kelly Preston's 16-year-old son died on Friday after suffering a seizure at the family vacation home on Grand Bahama Island, the family's lawyer said.

A house caretaker discovered Jett unconscious in the bathroom in the morning, according to a police report. Attempts to revive him were unsuccessful and he later was pronounced dead at Rand Memorial Hospital.

Travolta and Preston also have an 8-year-old daughter, Ella Bleu.

"[John]'s broken up. He just had to tell Ella a minute ago," family friend Michael McDermott told the Ocala (Fla.) Star-Banner on Friday, adding that "Kelly's very quiet."

"Just say a prayer for them," McDermott added. "That's all you can do at this point."

A Royal Bahamas Police Department spokesperson said Jett, who had a history of seizures, likely hit his head on the bathtub. An autopsy is being performed to determine the cause of death.