Jennifer Hudson and her family have offered a 100,000 reward (€80,000) for the safe return of her missing nephew.
Investigators are looking for forensic evidence near the childhood home of the singer and Oscar winning actress where her mother and brother were found shot dead.
Seven-year-old Julian King, the son of Hudson's sister Julia, has been missing since the bodies were discovered on Friday.
Julia's estranged husband has been listed as a suspect in the homicide investigation.