Brad and Angelina have made a special trip for one of their 17 children. They have reunited their son Pax with his biological grandmother in Vietnam. Pax, who is now 8 years old, spent a day with his gran who is called Nhan Dung. A source said: "It was a one day visit. Nhan was looking forward to it after Pax had lived so many years abroad." Brad and Ange adopted Pax in 2007 and this was the first time he had been back there since. The family were staying at an exclusive resort and invited Pax's gran there bet she wondered what was going on! Angelina and Brad are also parents to Cambodian-born Maddox, who is 10, and Ethiopian Zahara, who is 6, as well as their biological children. Ange recently revealed how she brings up the children. She said: "They are all learning about each other's cultures as well as being proud of their own. So it's not like just the boys get to do the Asian thing. They all have their flags over their beds and their individual pride." Ange and Brad have also employed specialist teachers to make sure the children can all speak their native language too. Ange said: "We have teachers who teach Cambodian and Vietnamese in our house and they know their flags, their music and quite a lot about their culture. We bring in as much as we can." Ange and Brad really are perfect parents aren't they!