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.

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.

The deaths appeared to be the result of domestic abuse, Bond said.

The tragedy comes as Hudson, who grew up in Chicago, continues to reach new heights in her career. Her song “Spotlight” is No. 1 on Billboard’s Hot R&B/Hip-Hop charts and her recently released, self-titled debut album has been a top seller. She was featured in this year’s blockbuster “Sex and the City” movie and is also starring in the hit film “The Secret Life of Bees.”