Ben was born after the couple tried for three years to conceive. "He's given the house a renewed spirit and purpose," Travolta told PEOPLE in 2011.
The Travoltas have recently taken over Cincinnati for the shooting of The Life and Death of John Gotti, where Travolta plays the notorious gangster and Preston plays his wife, Victoria.
The actor says he was drawn to the role because it showed the more sensitive side of the notorious Mafia boss.
"There's always two sides to a story," he said. "They had a very human other side of existence which is their family and their trials and tribulations."
Preston agrees, saying that Gotti was a different man to the world than he was to his loved ones.
"She knew what was going on, but she said when he would come home, the door would close and that life would end," Preston, 53, explained.
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