In couple and family therapy, the focus is on relationships, interactions, and the dynamics within the system. The therapist should strive to maintain a balanced and trustful relationship with all members of the system, and at the same time do justice to their individual wishes and perspectives. Couples and families usually present themselves with conflicts of interest that they have failed to resolve. Dealing with conflicts of interest is therefore an important element of couple and family therapy. The existing ethical guidelines, defined by psychological professional associations and medical ethics experts, are not specific enough at representing the complexities which family and couple therapists are confronted with. As an alternative to the ethical guidelines, Beauchamp and Childress (2008) have worked out general ethical principles: respect for autonomy, nonmaleficence, beneficence, and justice. In this chapter, a number of ethical problems in couple and family therapy are discussed against the backdrop of these principles. Problems in family and couple therapy can be addressed based on the question who of the system members carries more blame and who can execute more control. Four models of help, i.e., the medical model, the compensatory model, the enlightenment model, and the moral model, are presented with regard to this question. Finally, it is argued that ethical issues in couple and family therapy are relational and context-dependent. They must therefore be resolved in the encounter with each other.