Hollywood actor John Travolta has said he and his wife are "heartbroken" over the death of their 16-year-old son. Jett Travolta was found unconscious in the family's home in the Bahamas. "We are heartbroken that our time with him was so brief," said the Grease star. "We will cherish the time we had with him for the rest of our lives." Travolta's lawyer, Michael McDermott, said he understood Jett had "a history of seizures". A post-mortem examination is due to be held later. Jett was on holiday with his father, his mother Kelly Preston and his sister Ella Blue when he died. The couple have said previously that Jett first became ill at the age of two and was later diagnosed with Kawasaki disease, which causes inflammation of the blood vessels in young children.