Photo: Rogers and Cowan via Getty Images

Kelly Preston

John Travoltais remembering his late son, Jett.

TheGreaseactor, 67, shared a heartfelt Instagram tribute to Jett on Tuesday, which would have marked his 29th birthday. Jett, the son of Travolta and the lateKelly Preston,died in January 2009 while on vacation with his familyin the Bahamas. The teen, then 16, had hit his head on a bathtub after suffering a seizure at his family’s vacation home at the Old Bahama Bay Hotel on Grand Bahama Island.

“Happy birthday my beautiful Jetty. I love you,” Travolta wrote alongside a black-and-white photo of him with his son.

Travolta’s daughter, Ella, 21, commented three heart emojis on her dad’s post. She also shared her own tribute to her late brother, sharing a photo of the two together when they were younger.

“I love you Jetty. Happy Birthday❤️,” wrote Ella.

This marks Jett’s first birthday since Preston’sdeath in Julyafter a two-year battle with breast cancer. She was 57.

While Travolta and Preston did not speak often about Jett, who had Autism, the late actress did open up in November 2012 while on an episode ofThe Doctors.

“[Jett] was autistic. He had seizures and when he was very young, he had Kawasaki Syndrome,” Preston said at the time. “I strongly believe as a mother, as does my husband, that there are certain contributing factors that lead to autism and some of it is very much the chemicals in our environment and in our food.”

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John Travolta, Jett, Kelly Preston

Afamily representative told PEOPLE exclusively of Preston’s deathon July 12.

Travolta, who was married to Preston for nearly three decades, confirmed his wife’s death in a heartfelt Instagram post.

source: people.com