CHICAGO, Illinois (CNN) — A Chicago woman acknowledged that police have questioned her son in the killings of singer-actress Jennifer Hudson’s mother and brother but insisted that they should concentrate on finding the boy who is missing from the scene.

Michele Davis-Balfour pleaded for the return of 7-year-old Julian King, who has been missing since the slayings of Darnell Donerson and Jason Hudson. Their bodies were found in a house on the South Side of Chicago.

Davis-Balfour identified the boy as the actress’ nephew. Julia Balfour, Hudson’s sister, is married to William Balfour, who is reportedly being questioned in the slayings.

“Whoever has Jennifer Hudson’s nephew or Julia Balfour’s son, please, I’m begging you, me and my family are begging you to return that son,” Davis-Balfour told CNN affiliate WLS.

William Balfour says on his MySpace page that he is married to Jennifer Hudson’s sister Julia and has a stepson.

Davis-Balfour said she asked police to allow her 15-year-old daughter, Sensuous, to talk with Balfour but said authorities would not let her speak to him. Watch Davis-Balfour’s emotional appeal »

Chicago police spokesman Daniel O’Brien would not comment on whether a William Balfour was in custody or whether police had questioned a man by that name.

Quoting law enforcement sources, however, the Chicago Sun-Times reported that William Balfour was in police custody Friday night.

“Police have and continue to speak with numerous” people, O’Brien said. He said no charges had been filed against anyone in connection with the murders. Watch the police news conference »

Members of Hudson’s family were scheduled to make a statement later Saturday.

Deputy Police Chief Joseph Patterson said the bodies were found about 3 p.m. Friday (4 p.m. ET), when a relative arrived and found the body of a woman on the living room floor. The relative backed out of the house and called police, Patterson said. Authorities found a man shot to death in a bedroom.

The Cook County Medical Examiner’s Office said Saturday that Donerson and Jason Hudson suffered multiple gunshot wounds and ruled the deaths homicides.

Authorities did not identify the bodies, but Hudson’s publicist, Lisa Kasteler, said the actress’ mother and brother were found slain Friday.

Police issued an Amber Alert for Julian and asked residents to look out for a 1994 white Chevrolet Suburban with Illinois license plate X584859.

Julian is described as being 4 feet, 11 inches tall and weighing 130 pounds. He was wearing a striped brown polo shirt and khaki pants when last seen, authorities said in the Amber Alert.

The FBI is working with Chicago police to find Julian, Chicago Police Superintendent Jody Weis said. There is no evidence that the boy has been taken across state lines, which would make the abduction a federal offense. The action is being taken as a precaution because it would be possible to cross state lines in the amount of time the boy has been missing, he said.

WLS reported late Friday that a suspect, whom it now identifies as William Balfour, was in custody but that the boy, identified as Balfour’s stepson, was not with him when he was detained.

Davis-Balfour said her son had nothing to do with the killings.

“Out of no means did my son do this. This heinous crime to this family is unbelievable. It’s unbearable,” she said.

Neighbors reported hearing gunshots earlier Friday, Patterson said. Authorities found no signs of forced entry to the home and were not sure whether other items were missing. Watch the scene outside the house »

“You’ve got two people who were killed inside a home. That alone will produce a great deal of evidence,” Weis said of forensic evidence at the crime scene.

According to the Illinois Department of Corrections, Balfour, 27, is on parole. He spent nearly seven years in prison for attempted murder, vehicular hijacking and possessing a stolen vehicle.

His MySpace page also says he lives on Chicago’s South Side.

“I might as well let you all know that Jennifer Hudson is my wife’s sister I’m proud of her and wish her nothing but the best in what she do,” he wrote.

Hudson won a Best Supporting Actress Oscar for her portrayal of Effie in the film version of the Broadway musical “Dreamgirls.” She competed on the third season of “American Idol” in 2004, making it to the top seven contestants before being eliminated from the contest.

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Duration : 0:7:51