Tamantha Ryan / Page Six: Gigi and Bella Hadid's secret half-sister, Aydan Nix, gives rare insight into their 'warm and generous' sibling bond - Gigi and Bella Hadid's secret half-sister, Aydan Nix, said her siblings have been "warm and generous" since she met them in 2023. - "My sisters (along with the rest of the family) ...