Inclusion Criteria:  Family caregivers:  providing care for a co-resident family member with dementia being able to speak and read Japanese being 20 years of age or older.  Care recipients (group-based reminiscence therapy):  having a clear intention to participate in the intervention being able to speak Japanese being diagnosed with mild cognitive impairment or mild stage of dementia and MoCA scores ≥ 11 obtaining consent from their family caregiver and their doctor to participate in the intervention.  Exclusion Criteria:  Family caregivers:  having psychiatric disorder at the time of participation in the intervention.  Care recipients (group-based reminiscence therapy):  having insufficient capacity to give consent to participate in the intervention being diagnosed with moderate to severe stage of dementia or MoCA scores < 11.