Objective: To analyze the association between the caring ability and the burden, stress and coping of family caregivers of people in cancer treatment. Method: A crosssectional study with 132 family caregivers. The following instruments were applied: a characterization instrument, the Caring Ability Inventory, the Zarit Burden Interview, the Perceived Stress Scale, and the Brief COPE. The Spearman Correlation was used with significance <5%. Results: There were significant and positive correlations between total caring ability and: burden - interpersonal relationship (p=0.03); stress (p=0.02) and maladaptive coping (p=0.00); and inversely proportional correlations with problem-focused coping (p=0.03). The courage had inversely proportional correlation with: self-efficacy (p=0.03), interpersonal relationship (p=0.00), stress (p=0.04) and maladaptive coping (p=0.00). The knowledge had significant and positive correlation with problem-focused coping (p=0.00), adaptive coping (p=0.01), and inverse correlation with stress (p=0.02). Conclusion: The level of caring ability correlates with levels of stress and burden, and with the type of coping strategy used by family caregivers.