Participation in activity is essential for the psychological well-being of people with dementia. The potential benefits of home-based activity programmes may depend on family carers, but little is known about their experience. This study aimed to elicit carers' experiences of involving the person with dementia in activity. Thirty in-depth interviews (i.e. initial and follow-up) were carried out with 15 co-resident carers of people with dementia who were recruited through local community mental health teams. Data were analysed using a grounded theory method.