CHICAGO – The mother and brother of Jennifer Hudson were found shot dead Friday at a South Side home, and police were looking for a missing child who is the nephew of the singer and Oscar-winning actress.

A man suspected in the deaths was in custody Friday night, but the 7-year-old boy had not been located, according to published reports.

William Balfour was being questioned, but Julian King's whereabouts were not known, law enforcement sources told the Chicago Tribune and Chicago Sun-Times. Balfour has not been charged.

Police spokeswoman Monique Bond said investigators were talking to "a number of people in custody" but she declined to elaborate.

An Amber Alert issued Friday said Balfour was a suspect in the double homicide of Darnell Donerson, 57, and Jason Hudson, 29, whose bodies were found Friday afternoon in a South Side home.

Jennifer Hudson's personal publicist, Lisa Kasteler, confirmed the deaths.

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AP Music Writer Nekesa Moody in New York and AP Entertainment Writer Derrik J. Lang in Los Angeles contributed to this report.

Watch Video News:

Video 1 Jennifer Hudson's Mother and Brother, murdered

Video 2 Hudson's Family Pastor On Double Homicide

Video 3 Reports: Hudson Murder Suspect In Police Custody