The aims of this study are : ( 1 ) to investigate the effectiveness of Grief-Help , a nine-session cognitive-behavioural treatment for childhood PGD , combined with five sessions of parental counselling , immediately after the treatment and at three , six and twelve months follow-up ; ( 2 ) to examine tentative mediators of the effects of Grief-Help , ( i.e. , maladaptive cognitions and behaviours and positive parenting ) , and ( 3 ) to determine whether demographic variables , child personality , as well as symptoms of PGD , anxiety , and depression in parents moderate the treatment effectiveness .