UPDATE - Julian King Photo: Dead Body Found in Suspect Vehicle

Suburban Chicago police are still searching Saturday for the 7-year-old nephew of singer-actress Jennifer Hudson after finding her mother and brother slain, police say.

The boy, identified as Julian King, has been missing since Hudson's mother, Darnell Donerson, and her brother, Jason Hudson, were discovered shot to death Friday in the South Side Chicago home owned by Hudson's mother, The Chicago Sun-Times reported.

Officials say the boy is the son of Julia Hudson, Jennifer Hudson's sister.

Police were also looking for a white SUV that police believe Balfour could have driven from the Hudson home, several sources told the Sun-Times.

"I'm not going to let them put my son down," Balfour's mother, Michele Davis Balfour, told reporters. "My son had nothing to do with this … and I'm very upset with the police because they are refusing to let me see my son."

William Balfour is not speaking so far to police. But this is what his myspace page says. Balfour on myspace is "FLEX A MILLION, THATS WHAT U BETTER CALL ME" Male, 27 years old CHICAGO, Illinois, United States"

Flex writes: "About me: I AM A 26 YEAR OLD, I RESIDE ON THE SOUTH SIDE OF CHICAGO, I HAVE A WIFE HER NAME IS JULIA, AND I ALSO HAVE A 6 YR OLD STEPSON, I DON'T TOLERATE BULLSHIT, SO DON'T COME TO ME WITH IT, I LIKE TO LIVE LIFE AND EXPERIENCE EVERYTHING THATS WHY I'M HERE SEEING WHAT IT'S ABOUT, 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 BUT DON'T HIT ME UP ASKING BOUT HER, OTHER THAN THAT IT'S ON "

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UPDATE - Julian King Photo: Dead Body Found in Suspect Vehicle

Darnell Donnerson (Photo) Murdered, William Balfour (Photo) Suspect