( CNN ) Discovery of the body of a young girl who may have been dead for weeks has led to the arrest of her teen sister -- herself a mother -- and a search for the girls ' parents , who may be in California with five other children , police in North Las Vegas , Nevada , said . The investigation began Wednesday when the 4-month-old infant of the 17-year-old was taken to Sunrise Hospital and Medical Center in suburban Las Vegas , authorities said . Police arrested the teen mother on one count of child abuse with substantial bodily harm . She was taken to a juvenile facility . Police department spokesman Aaron Patty told CNN affiliate KVVU that the `` infant did not receive the proper care and nourishment that she needed at the time , which is what led to the arrest of the 17-year-old . '' A day later , a search warrant was served at the family 's home . That 's when police found the body of the 3-year-old girl , who had apparently been dead `` for at least a few weeks , '' according to police . The teen mother was then arrested on one count of child abuse with death in connection with her younger sister 's death , according to a police statement . The parents left the home several months ago with the other five children , ranging in age from 1 to 9 years old , but , according to Patty , `` they left the 3-year-old child and the 17-year-old sister at the residence alone . '' Authorities are seeking the parents , 39-year-old Jondrew Lachaux and 38-year-old Kellie Phillips . Police say the five children with them may be in danger . `` We believe that they went to California at some time and may have gone back and forth during this multiple month process when they left , '' Patty said . No Amber Alert was issued , according to police , because the 4-month-old did not die . Lachaux and Phillips , who are the child 's grandparents , are being sought for questioning . `` We are asking for the assistance of the public in locating these two individuals , '' said Patty . `` We believe they can answer many questions on what led up to the death of this child . '' The 4-month-old infant was last reported to be hospitalized in critical condition . Her mother 's name was not disclosed .
Parents wanted for questioning after girl 's body found at home . California police : 3-year-old had been dead for at least a few weeks . 17-year-old sibling is held in case .