Credit: Michael Rozman

John Travolta says he is grateful for all of the support he has received since his son Jett died at age 16 following a seizure this past January.

"I just want to take one moment to thank each and every one of you throughout this country, through out the world for all your support and all your love for our family," he says on The Ellen DeGeneres Show Wednesday. "Thank you very much."

His 9-year-old daughter Ella -- who makes her film debut with her dad in their upcoming comedy Old Dogs (out Nov. 25) --- also appears with him for her first talk show interview.

"You are so proud of her, aren't you?" DeGeneres asks Travolta, 45, of his daughter.

"I'm holding back the tears..." he says as DeGeneres hands him a tissue.

Travolta also reveals his new hobby: tennis

"I play everyday," he says. "I play at midnight, kind of vampire-style."

Who does he play with? His housing staff.

"The house manager and the house maintenance person," he says. "At midnight, we go to the local tennis court."