Brad Pitt and Angelina Jolie refused to hide the truth of her double mastectomy surgery from their six kids, but spared them the adult version of events. Pitt tells U.S. TV show Extra the couple has a "no secrets" policy when it comes to their children and so when Jolie learned she was a cancer high risk, she sat the family down and explained what had to happen next. At the after party for the premiere of his new movie World War Z in London on Sunday (02Jun13), Pitt explained, "I mean there's an age of understanding, so you've got to present it in a way that is age appropriate, but we know our children very well... We want everything to be on the table and any questions they have for them to ask. "We unleash certain things on them when it's out of the scary zone... and we know where we're heading." The premiere was Jolie's first public appearance since she revealed she had undergone a double mastectomy last month (May13).