He adds, "We made this declaration some time ago that we weren't going to do it till everyone can.
"But I don't think we'll be able to hold out. It means so much to my kids, and they ask a lot.
"And it means something to me, too, to make that kind of commitment."
So does this mean he's actually popped the question?
"I'm not going to go any further," he says. "But to be in love with someone and be raising a family with someone and want to make that commitment and not be able to is ludicrous, just ludicrous."
As for adding to the brood, he says they haven't ruled out the possibility.
"We haven't closed the book on it," he says. "There's a really nice balance in the house right now, but if we see the need and get that lightning bolt that says, 'We can help this person; we could do something here,' then absolutely."
He might be hearing the pitter-patter of tiny feet sooner rather than later - the tabloids are humming with speculation that Jolie is three months pregnant.
A recent cover story in OK! magazine, quoting an ever-reliable "unnamed source", claims Jolie has told friends she's pregnant again.
"She's almost three months along," said the snitch. "It's not something she wants to officially announce but she's at a point where she is telling a select group of people."
And now a global audience. Oops!
Jolie, 36, dished on the possibility of more kids when she hit up the cover of Marie Claire in December.
"Nothing planned at the moment, but we just don't know," she said of the possibility of a seventh child. "I could end up pregnant."
Pitt also opened up about his past struggles with THR, revealing that he was a heavy pot smoker in the late 90s.
"I got really sick of myself at the end of the 1990s. I was hiding out from the celebrity thing, I was smoking way too much dope, I was sitting on the couch and just turning into a doughnut and I really got irritated with myself," Pitt recalls.
"I got to, 'What's the point? I know better than this'. I used to deal with depression, but I don't now, not this decade - maybe last decade. But that's also figuring out who you are. I see it as a great education, as one of the seasons or a semester - 'This semester I was majoring in depression'."
He continued: "I was doing the same thing every night and numbing myself to sleep - the same routine. Couldn't wait to get home and hide out. But that feeling of unease was growing and one night I just said, 'This is a waste'."
Pitt says an eye-opening visit to Morocco in the late '90s where he saw "poverty to an extreme I had never witnessed before" was the wake-up call he needed.
"I just quit. I stopped grass then - I mean, pretty much - and decided to get off the couch."
Click on over to The Hollywood Reporter for Brad's full interview.
And check out a behind-the-scenes video of his cover shoot:
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