Angelina Jolie – actor, film-maker, humanitarian – had invited us to spend two days with her, to let us into her world. To say the home she shares with her six children – Maddox, 19, Pax, then 16, Zahara, then 15, Shiloh, 14, and 12-year-old twins Vivienne and Knox – is full of life would be an understatement.