The objective of this study was to answer the following research question: What do make the board of directors of family firms be effective in strategic decisions? Therefore, the configurational approach was adopted, since there are multiple ways of achieving effectiveness in strategic decisions. Conceptually, strategic decisions were considered effective when reached or exceeded the results previously established by the decision makers. In relation to family firms, they were defined based on sociometional wealth (SEW), which consists of the importance attached by decision-makers to the non-economic benefits generated to the family from the company's operations. The dimensions of SEW combined with the roles and psychosocial processes of boards of directors generate different configurations that lead to effectiveness in strategic decisions. To demonstrate this, a survey with 59 family firms was carried out in Brazil. The respondents were board members who participated in a strategic decision-making in these firms. The results show that there are multiple ways to achieve effectiveness in strategic decisions. Among the core factors, the roles of control and mediation are necessary conditions, as well as the use of knowledge and skills and cognitive conflict. It is also possible to identify three different family business profiles from SEW. The first attaches little importance to family continuity in the business in their decisions, the second does not give importance to family prominence, and the third considers all SEW atributes in their decisions. Even with different reference points, these firms can be effective in their strategic decisions. This research has theoretical and practical implications, especially for reinforcing the argument that there is no single way to achieve a result, and the effectiveness of boards of directors goes beyond the control and service functions, being linked to the strategic decision effectiveness.