John Travolta pays tribute to late son Jett on what would have been his 30th birthday

• John Travolta shared a tribute to his late son Jett on Wednesday, the day Jett would have turned 30.
• "I miss you more than words can say. I think about you everyday. Happy Birthday," Travolta wrote.

John Travolta honored his late son Jett Travolta in a social-media tribute on Wednesday, the day Jett would have turned 30 years old.

The "Grease" actor, 68, shared a black-and-white Instagram photo of himself and Jett, whom he shared with his late wife Kelly Preston. The couple is also parents to Ella Travolta, 22, and Benjamin Travolta, 11.

"My dearest Jetty, I miss you more than words can say. I think about you everyday. Happy Birthday. Love, your Dad," John captioned the photo.

Ella left a comment on her father's post that reads: "Happy Birthday Jetty, we love you so much."

While on a family vacation in the Bahamas in 2009, Jett hit his head on a bathtub after having a seizure and died. He was 16 years old.

In the aftermath of Jett's death, John and Preston, who died of breast cancer in July 2020, set up The Jett Travolta Foundation. According to the charitable organization's website, it uses resources to "assist and provide relief" to children with special needs, among several other initiatives.

The couple rarely spoke publicly about Jett's death in the years that followed, however Preston opened up about his health on a 2012 episode of "The Doctors."

She said Jett had been diagnosed with autism spectrum disorder and suffered seizures throughout his life, along with having Kawasaki Syndrome, an inflammatory disease most common in infants and children, when he was young.

During an August 2021 episode of Kevin Hart's talk show "Hart to Heart," John recalled a recent conversation he had with Benjamin about mortality, during which he spoke about both his late son and late wife.

After Preston died, the now 11-year-old worried that his father would die too, John explained. So, the actor gave his son a candid response.

"Nobody knows when they're going to go or when they're going to stay. I said, 'Your brother left at 16 — too young. Your mother left at 57. That was too young. But who's to say?' I said 'I could die tomorrow. You could. Anybody can,'" John told Hart.

He continued: "So let's look at life, that [death is] part of life. You see, you don't know exactly. You just do your best at trying to live the longest you can."