ALBAWABA - Bella and Gigi Hadid reveal secret half-sister Aydan Nix publicly. The Hadid sisters, Bella and Gigi Hadid, have taken to social media to divulge some surprising information about their family. They have disclosed that they have recently learned that they have a younger half-sister named Aydan Nix. The model sisters issued a statement in which they stated, "More than twenty years ago, our father, who was an only ...