Families in Taiwan are considered central in caring for frail older people. However, rapid social changes are reshaping Taiwanese family values and structures. In this study, we explored the challenges of intergenerational families in caring for frail older people in Taiwan. Using a multiple-case study, 32 participants representing 12 families comprising three or more generations participated in individual, semistructured interviews. A grounded theory technique was used for the data analysis. Four themes emerged in the findings: intergenerational and intragenerational disharmony, restrictions in the physical environment, financial caregiving burdens, and lack of support from the healthcare system. The findings can help raise awareness of filial caregiving obligations of aging family members that have shifted from a parent-child dyad to being shared across multiple generations in Taiwan. Intergenerational caregiving for frail older people has become a challenge for policies aimed at keeping the aging population in the community.