She is eligible for a parole hearing every two years beginning at the 30-year mark.
David Smith told the parole board Wednesday, "I will be here every two years going forward to ensure that their death doesn't go in vain."
Susan Smith has faced disciplinary action several times in prison, including for sexual encounters with corrections officers, drug possession and for giving contact information for family and her ex-husband to a documentary producer.
Susan Smith's attorney, Tommy Thomas, told the parole board this case is about "the dangers of untreated mental health." He said Susan Smith had undiagnosed depression after her second son was born.
Thomas highlighted that she has no prior criminal history, and he said if she's paroled, she'd live with her brother.