Background and objective: Given that most dementia care is provided at home by family caregivers, caregivers' health and outdoor activities may influence persons with dementia (PWDs)' mobility. At the same time, PWDs' functional deterioration and mobility changes might affect mobility behaviours in their caregivers. The aims of this pilot study were to examine the relationship of PWD's life‐space mobility (LSM) with their caregiver's LSM and to investigate the role of caregiver and PWD characteristics in determining the level of LSM in both PWDs and caregivers.