I just found this after posting about the murders and missing children on a different 'missing' thread.
QUEEN CREEK, Arizona (AP) -- An Amber Alert was issued for two young children missing from their home where the bodies of their grandparents and an uncle were found slain, police said Monday.
The Maricopa County Sheriff's Office said 18-month-old Brian Cervantes and his 3-year-old sister, Jennifer Cervantes, were believed to be with their father, Rodrigo Cervantes Zavala.
The grandparents and uncle found dead late Sunday were relatives of the children's mother, who was not at home at the time of the slayings, investigators said.