Positive relationships are considered to be one of the most important protective factors in the development of the individual. Relational Competence Theory states that there are competen-cies that promote the establishment and maintenance of positive relationships. Danish family therapist and writer Jesper Juul defined relational competence as a loosely interconnected set of relational values and attitudes. The current study examines if relational values and attitudes can be used to predict relationship quality. A survey conducted with a small sample (N = 51) of parents of junior high school students in Central Switzerland was used to measure the predictor variables Respect for the Other’s Individuality, Authenticity, and Responsibility for the Rela-tionship, as well as two different measures of relationship quality. The variables were measured both for the relationships between parents and their children and romantic partner relationships. A regression analysis showed that the three predictors significantly predicted relationship quali-ty in both types of relationship. The effect sizes varied from medium to large. Even though these findings are not causal in their nature, they suggest that these three variables may be part of a wider set of relational values and attitudes that promote positive relational outcomes. One possible implication may be that individuals can improve their relationships by reconsidering their relational attitudes and values.