DISCOVERED! INSANE! Baby Found Inside Kimchi Box on the Roof of Grandmother's House

Authorities are investigating an ongoing true crime case involving young parents who have had two infants pass away under suspicious circumstances. The latest involves the body of their 15-month old infant daughter discovered in a kimchi box that had been stored on the rooftop of her grandmother's house for three years. How much punishment should these two receive for their heinous actions?