Jennifer Hudson's Mother Found Dead and Her nephew missing

Law enforcement sources tell TMZ Jennifer Hudson's mother was one of two victims shot and killed in Chicago earlier today.
A neighbor tells TMZ the other victim was Jennifer's brother Jason. A cousin who lived nearby discovered the bodies.
We're told the two bodies were found dead on the scene at 2:44 PM. When the fire department arrived and discovered the bodies, police were brought in and the home was declared a crime scene.
A call to Hudson's rep was not immediately returned.

An all points bulletin has been issued for a boy, believed to be Hudson's 7-year-old nephew (right), who may have been taken from the scene. Police are looking for 1994 white Suburban with the license plate X584859.

Police are looking for William Balfour (left), who they claim could be with the missing 7-year-old. According to records, Balfour listed Hudson's mother's address as a place of residence within the last year. According to the Illinois Department of Corrections website, Balfour is currently on parole after serving jail time for attempted murder.

Lost in all this is Jennifer's sister Julia, mother of the missing 7-year-old. We're told she works as a bus driver in Chicago. Her employer told us she worked her shift today. She hasn't been seen since.

A WBBM reporter is saying that neighbors have said a family member in the Hudson household apparently tried to steal a car a few weeks ago, an argument ensued, and he vowed revenge. A photo on Julia's MySpace page (bottom) posted prior to today's events alludes to some kind of dispute with William over a car.