The Twin Original Tribrids. Celine & Leon Mikaelson. The children of Klaus Mikaelson & Aurora de Martell. Klaus and his siblings have no idea the two were ever born. The twins believe their father abandoned them and their mother. They grew up on the run with their mother, Uncle Tristan, and Uncle Lucien. This is their story and what would happen if they existed in the TVD universe. This story will start on season 2 episode 3 of TVD. There will be cursing and some sexual scenes eventually.