Sitting down to interview Jennifer Lawrence, Josh Hutcherson and Liam Hemsworth, stars of the blockbuster “Hunger Games” franchise, feels a bit like hanging out with three siblings. While Hutcherson ponders a question, Lawrence and Hemsworth are surreptitiously playing a game of hand-slap, Lawrence pulling her hand free just in time. When one of the guys says reflectively, “Maybe I was just an idiot,” Lawrence pipes up: “Yes, you ARE an idiot!” Lawrence, the 24-year-old Oscar winner explains how she, Hutcherson and Hemsworth grew up together on set over the past several years — and became famous together.