My estranged, Protective, Older brother

Overview: Laura is a Furyan, she was born five years after her brother gave birth to her old brother Riddick. Back then the necromonger officer Zhylaw attacked Furya in an attempt to kill all male children, going as far as to personally strangle newborn infants with their own umbilical cords. He tried to strangle Riddick with his own umbilical cord and thought Riddick died, but Riddick actually survived. Laura’s mother stayed with both of them until Riddick turned 13, and then she left him with an elderly couple knowing she was only going for one more year. She stayed with an elderly Lady until her last dying breath. The elderly cared for her, but what happens when she dies? Does Riddick find his lost sister? Do they survive?