(Newser) – A Christmas Day party ended in tragedy for one California family, with a 23-year-old arrested for allegedly murdering his grandmother and his dad's girlfriend. Detectives say family members had assembled at the Reedley, Calif., home to exchange gifts when Austin Alvarez arrived. Per a press release from the Fresno County Sheriff's Office, "During the visit, Alvarez fired shots striking his grandmother (Magdalena Alvarez) and his father’s girlfriend (Meisa Rashid)." Both women, ages 58 and 39, respectively, died of their wounds.