Jennifer Hudson Jennifer Hudson

A day after her mother and brother were slain in a double homicide, Jennifer Hudson's 7-year-old nephew still is missing — and his mother is begging for his safe return.

Darnell Donerson, 57, and Jason Hudson, 29, were found shot dead in their home on Chicago's South Side on Friday, the apparent result of a domestic disturbance, law enforcement officials have said. Hudson's nephew, Julian King, has not been seen since the crime scene was discovered.

On Saturday afternoon, at the Pleasant Gift Missionary Baptist Church on the South Side, Jennifer's sister, Julia, made a plea for the return of her son. "I don't care who you are, just let my baby go," the Chicago Tribune quotes her as saying. "I just want my son back. He doesn't deserve this."

"My greatest fear has already happened," she went on to say. "My greatest hope is for him to come back."

Julia said that when she spoke with Jennifer on Friday, she "was screaming" and "flew in [to Chicago] right away."

Authorities on Friday evening issued an Amber alert for King, who last was seen wearing a striped polo shirt and khaki pants. The FBI has since become involved in the search for King, as they do in the disappearance of any missing child.

William Balfour — who is currently separated from wife Julia Hudson — was taken into custody Friday for questioning, but was not immediately charged with a crime. Records from the Illinois Department of Corrections show that Balfour, 27, is on parole after spending nearly seven years in prison for, among other crimes, attempted murder. One of his last known addresses is listed as Donerson's home, from which he was thrown out last winter.

"I didn't raise no murderer," Balfour's mother, Michele, said on Friday. "He was not a child abductor. They have the wrong person."

Both of the shooting victims died of multiple gunshot wounds, and their deaths were ruled homicides by the Cook County medical examiner's office