And at the time, wherever Fox went, his family joined him.

“Sam doesn’t get it,” he said. “You can’t explain to him that I’m doing a movie. He doesn’t really care. All he knows is that he’s being dragged someplace. When he was 3 months old, he flew to Canada, then to New York City, then drove to Martha’s Vineyard and Vermont, then flew from New Hampshire back to L.A. He’s seeing the world, and it all looks the same to him. When you’re that age, it’s as exciting to go to Van Nuys.”

Asked if they thought about having more children, Fox said, “Tracy and I kind of have an agreement. While we’re still changing diapers, we don’t even talk about it. But I think it’s likely; we both come from big families.”

Whether or not they looked to their own still-married parents as inspiration, he added, “A lot of that is unspoken. We don’t say, ‘We’re going to be together forever.’ It’s not that Pollyanna-ish. We just say, ‘This is a cool thing. Let’s not talk about it—and maybe it won’t go away.'”