The couple had forced the victim to live in squalid conditions, while cooking, cleaning and caring for their children before she collapsed and was admitted to hospital.
The methamphetamine, solely for the Australian market and destined for Victoria and NSW, would have amounted to almost 19 million individual street deals.
The crash killed 42-year-old mother Nancy Lefrançois and her 11-year-old son Loïc Chevalier, who were travelling in a passenger vehicle struck in the collision.
