This is an intervention study for informal caregivers of adult patients with an acquired brain injury (stroke, traumatic brain injury or cerebral haemorrhage). It will determine whether an internet-based supportive coaching offers benefits to the caregivers in their own process of coping in the aftermath of a brain injury of a close relative. We expect the internet-based supportive coaching to be more effective in the treatment of emotional distress reactions and caregiver burden than the treatment as usual.