William Balfour -- the "person of interest" in the murders of Jennifer Hudson's mother, brother and nephew -- isn't the first Balfour to run afoul of the law.
Balfour's father is currently serving a 30-year prison sentence for murder. His brother served time for drug dealing.
Balfour himself has served time for attempted murder and carjacking.
According to court documents obtained by TMZ, Balfour was a member of the Gangster Disciple Street Gang.
Also according to court docs, Balfour told the judge back in 1999 he had a good relationship with his mother until "she gets an attitude."