John Travolta's first child, Jett, was born on April 13, 1992. He began suffering seizures at the age of 2 when he was diagnosed with Kawasaki syndrome, which can cause inflammation in blood vessels, per the Mayo Clinic. He died on Jan. 2, 2009, per People, after having a seizure and hitting his head on a bathtub in the Bahamas.
John shared a tribute to his first child on what would've been his birthday in April 2022, writing, "My dearest Jetty, I miss you more than words can say. I think about you everyday. Happy Birthday. Love, your Dad."