Objectives: The present study used Pearlin, Mullan, Semple & Skaff's (1990) caregiving stress process model as a framework to examine the comparative influence of two stressors: (a) intergenerational ambivalence as a unified construct and (b) dyadic strain, which is one isolated component of intergenerational ambivalence. Methods: Participants were 120 women providing healthcare and medication assistance to an earlier generation family member with physical and/or cognitive impairments. Results: Hierarchical regression confirmed that intergenerational ambivalence explained perceived stress in family care partners, beyond the variance accounted for by other commonly reported stressors such as length of caregiving experience, memory/cognitive and functional impairments of the care recipient, caregiver overload, family conflict and financial strain. Further analyses revealed that examining dyadic strain apart from intergenerational ambivalence may more accurately explain the influence of ambivalence scores on care partners' perceived stress. Conclusions and Clinical Implications: The comparative influence of dyadic strain versus ambivalence suggests that stress-reducing interventions may benefit from a focus on reducing care partners' experiences of negative strain in the dyadic relationship rather than managing ambivalence.