In the wake of Brad Pitt and Angelina Jolie's very public divorce, many fans have been wondering about their six children. Mark Billingham was the head of security for the family. For 18 months, he was in charge of protecting the gamily and ensuring their safety. In a recent interview, Billingham said he practically "fathered" their children when Pitt and Jolie worked. He said that one of the biggest concerns was that one of the children might get kidnapped.