Mommy's Little Helpers is the fifteen episode of Season 6. It aired on November 23, 2012.
When Hilma Marie Witte's relationships go bad, she turns to her sons, Eric and John, to help - Eric shoots his father, Paul, and John murders his grandmother, Elaine, with a crossbow so his mother can keep stealing Elaine's money. John exposes his mother as the mastermind of both murders. After drug dealer Greg Smith breaks up with his girlfriend Cindy Baillee, Greg's mother, Lois "Mean Nadean" Smith, a hot-tempered bully who is fiercely protective of her son, responds to rumors that Cindy plans to turn Greg in by luring Cindy away to be sadistically tortured and killed, then has Greg and his new girlfriend, Teresa Baker, clean up the crime scene. Teresa confesses, and Lois is sent to death row. In Glasgow, Scotland, Edith McAlinden is a vagrant, thief, prostitute and alcoholic, and is jailed for assault. On her first night of freedom, a drinking binge turns deadly when Edith stabs her boyfriend, David Gillespie, causing him to bleed to death, and then enlists her 16-year-old son, John, and his friend, Jamie Gray, to murder the two surviving witnesses.