And on Saturday the 65-year-old Grease actor said in a tear-jerking Instagram post that he still very much loves his child on what would have been his 27th birthday.
'A painting a fan made of my son Jett! Happy birthday my son I love you!' the 65-year-old captioned his Instagram post.
Missing you: John Travolta lost his son Jett in 2009. And on Saturday the 65-year-old Grease actor said in a tearjerking Instagram post that he still very much loves his child on what would have been his 27th birthday
They also have daughter Ella Bleu, 19, and son Benjamin, aged seven.
Jett was only 16-years-old when he unexpectedly died while on vacation with his family in the Bahamas.
The teenager had a seizure, hit his head then fell into the bathtub at his family's vacation home at the Old Bahama Bay Hotel on Grand Bahama Island.
He was declared dead at Rand Memorial Hospital.
His mother Kelly Preston also took to Instagram, saying, 'Happy Birthday Jetty, my sweet love.'
One week ago, the actress shared an emotional Instagram post along with a black-and-white photo of Jett smiling between his two parents in a big bed as they both kiss him on the cheek.
Sad loss: One week ago, the actress shared an emotional Instagram post along with a black-and-white photo of Jett smiling between his two parents in a big bed as they both kiss him on the cheek
'To my sweet love, Jett… you are in our hearts forever,' Preston lovingly wrote.
'I send love to all of the beautiful autistic children and the wonderful people who love them.
'May we all shine and grant love and respect to children with special needs,' she added.
In 2003, Preston said Jett had Kawasaki Syndrome, which is an inflammation of the arteries.
In January John said Ella and Benjamin were thriving.
'They're smart kids and they do well because they're encouraged to apply what they learn,' he said. 'Ella is making a living as an actress. We're very proud of her. She's old-school elegant and gifted in the arts.'
Ella recently wrapped filming the crime thriller The Poison Rose alongside Brendan Fraser, Morgan Freeman and her father.
Benjamin has also been bitten by the acting bug.
Kelly revealed that their relationship is not without challenges but they 'were just right together' from the start.
'We picked the right people and [keep] it honest and [communicate] and [check] in with each other. A relationship doesn't just happen. You have to work at it. You've got to keep it fun, and that's what we do.'
© Associated Newspapers Ltd.