With a daughter turning 5 this weekend (Happy birthday, Shiloh!) and just a few weeks until Father's Day, busy dad Brad Pitt is opening up in a new interview about family life with Angelina Jolie.

"The kids ask about marriage," he tells USA Today over a cup of cappuccino. "It's meaning more and more to them. So it's something we've got to look at."

The 'Tree of Life' star, 47, admits that fears about his six kids' safety "keep me up at night." Reflecting on what parenthood means to him, he explains, "Kids hold up a mirror to you....You can't make excuses. You've got to make sure they've brushed their teeth and eaten a good breakfast. You want to be present if they wake up with a bad dream."

A round-the-clock nightmare for the Pitt-Jolie brood? Paparazzi. "We're hunted," he says, "Our kids have to live behind a gate. Outside, there are people with cameras."

"But I'll take the trade-off," he adds. "I never knew I was capable of experiencing so much love."