Grimm Hunters

Nick Burkhardt, an eponymous Grimm is a homicide detective, whose Aunt Marie tells him that he is descended from a line of hunters, called Grimms, who fight supernatural forces. Even before his abilities manifested, Nick had an exceptional ability to make quick and accurate deductions about the motivations and pasts of individuals, which has now expressed itself as his ability to perceive aspects of the supernatural that nobody else can see. - Wikipedia

Kelly Burkhardt is a Grimm who is also Nick Burkhardt's mother. Her first appearance was in the last episode of season 1 (episode 22). For 18 years Nick had believed that both of his parents had died in a car crash. Only after learning that he was a Grimm did Nick find out that his parents had actually been murdered. - Wikipedia