Kevin, a struggling actor on the show, is Ventimiglia's onscreen son and is played by Justin Hartley, reported Entertainment Weekly.
"At first, I was like, 'Should I be Kevin?' Because I'm an actor. So I'm thinking, 'Well, maybe, no, I'll be the actor,'" Ventimiglia said during a panel on the hit family show.
"But then, you know, I'd been a huge fan of not only Dan Fogelman but John Requa and Glenn Ficarra, and I knew the three of them together, and I believed in what they believed in me."
"When I dove into Jack, I found this instant connection to a man that felt incredibly familiar even though I don't have kids and it just felt right," the actor said.
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