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Rapper-record producer Jay-Z has revealed what led to the fallout with his former best friend and rapper Kanye West.

Speaking on a podcast, Jay Z, whose real name is Shawn Carter, explained that West angered him by bringing up his and Beyonce Knowles’ daughter Blue Ivy in one of his infamous onstage rants.

“What really hurt me is, you can’t bring my kids and my wife into it. Kanye’s my little brother, he’s talked about me a hundred times, he made a song called Big Brother,” he said.

“We’ve gotten past bigger issues. But you brought my family into it, and that’s a problem with me. That’s a real, real problem. He knows it’s a problem, he knows that he crossed the line.”

The two rappers collaborated on the 2011 album, Watch The Throne.

Jay Z added: “We’ve never let this amount of space between one of our disagreements, and we’ve had many. It’s part of who we are. That’s what I like about him, he’s an honest person, he’s open.”

During a concert last year, West discussed his row with Jay-Z, and claimed Knowles was acting like a diva.