Background: The family interview context is permeated by numerous ethical issues which may generate conflicts and impact on organ donation process. Objective: This study aims to analyze the family interview process with a focus on principlist bioethics. Method: This exploratory, descriptive study uses a qualitative approach. The speeches were collected using the following prompt: “Talk about the family interview for the donation of organs and tissues for transplantation, from the preparation for the interview to the decision of the family to (...) donate or not.” For the treatment of qualitative data, we chose the method of content analysis and categorical thematic analysis. Participants: The study involved 18 nurses who worked in three municipal organ procurement organizations in São Paulo, Brazil, and who conducted family interviews for organ donation. Ethical considerations: The data were collected after approval of the study by the Research Ethics Committee of the School of Nursing of the University of São Paulo. Results: The results were classified into four categories and three subcategories. The categories are the principles adopted by principlist bioethics. Discussion: The principles of autonomy, beneficence, non-maleficence, and justice permeate the family interview and reveal their importance in the organs and tissues donation process for transplantation. Conclusion: The analysis of family interviews for the donation of organs and tissues for transplantation with a focus on principlist bioethics indicates that the process involves many ethical considerations. The elucidation of these aspects contributes to the discussion, training, and improvement of professionals, whether nurses or not, who work in organ procurement organizations and can improve the curriculum of existing training programs for transplant coordinators who pursue ethics in donation and transplantation as their foundation. (shrink)