Avatar director James Cameron and his wife Suzy Amis have officially filed to become legal guardians of their daughter's 16-year-old friend.The Blast reported on Tuesday that the 65-year-old filmmaker and 58-year-oldenvironmental advocate have filed a petition to become guardians of a 16-year-old girl who is close friends with one of their daughters.It remains unclear which child is companions with the teenager but the couple have two daughters 19-year-oldClaire and 13-year-oldElizabeth as well as 16-year-old son Quinn.Scroll down for video Nice gesture:Avatar director James Cameron and his wife Suzy Amis have officially filed to become legal guardians of their daughter's 16-year-old friend according to The Blast, they are seen in February.