Angelina Jolie’s children helped her cope with her latest movie role. The 49-year-old actress plays renowned opera singer Maria Callas in Pablo Larraín’s new biopic ‘Maria’ and Angelina – who has six children aged between 16 and 23 – revealed she relied on her kids whenever she had a tough day on set. She told The Hollywood Reporter: “I have never had a set where my family is not allowed to be there because I’m focusing — I’m not that person. You can climb all over me or visit. It really meant a lot that my boys were with me on ‘Maria’. When I would have really heavy times, they would come ove…