1 / of 2 Hannah Clarke's parents push for coercive control to be made a crime one year on from horrific murders Posted SatSaturday 13 updated ThuThursday 18 FebFebruary 2021 at 10:34pm Sue and Lloyd Clarke, the parents of Hannah Clarke, say coercive control is difficult to recognise. ( Share Print text only Cancel One year on since the horrific murders of Hannah Clarke and her three children, her parents have channelled their grief into campaigning for coercive control to be made a crime — legislation the Queensland Government says it will introduce within the next four years. Hannah and her children Aaliyah, 6, Laianah, 4, and Trey, 3, were ambushed by her estranged husband Rowan Baxter in their car on the morning school run, when he doused them in petrol and set them alight in the Brisbane suburb of Camp Hill on February 19, 2020.