For Chris Pratt andAnna Faris, starting a family was a no-brainer.

More accurately, it was (as things always are in their marriage) two brains acting as one.

“It started [for us] around the same time, and I don’t think one of us wanted it any more than the other,” says theGuardians of the Galaxystar, who talks with PEOPLE about fatherhood, marriage and his rise to fame in the magazine’s new issue. “She would say, ‘How do you feel about that?’ and I would say, ‘Damn, I’ve been kind of thinking about that too! I think that’d be cool. Let’s make that happen.'”

But when their son,Jack, wasborn nine weeks prematurein August 2012, the couple felt a helplessness with which many parents are all too familiar.

“We were scared for a long time,” Pratt, 35, says of the month that his first-born spent in an intensive care unit. “We prayed a lot.”

He turned to his family and close friends for support. And even at the darkest of hours, he treasured every moment with his son.

Chris Pratt PEOPLE shoot

Jeff Lipsky

And now with Jack happy, healthy and approaching his second birthday, “he is such a fighter, he’s amazing,” Pratt says, laughing. “He’s so open and there’s no fear in him no matter what.”

With a smile, the proud dad adds, “He is so charming that my plan is to just let him take care of us as soon as he’s old enough.”

Faris, 37, who currently stars on the CBS comedyMom, also explainsher husband‘s appeal … in her own hilarious fashion. Sure, he’s funny and sweet, she says, but he’s often underestimated.

“It’s easy to assume he is sort of a golden retriever of a man, but he’s really smart,” she tells PEOPLE. “He’s a really loving father, he is an incredible husband. He doesn’t let fame seduce him. He’s still the same dude.”

For much more from the interview, pick up the latest issue of PEOPLE, on newsstands Friday.

— Reagan Alexander

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source: people.com