Purpose – The purpose of this study is to analyze the relationship between family influence, measured through power, experience and culture (F-PEC) and family business (FB) performance. Performance is measured from a financial and non-financial perspective. Design/methodology/approach – Empirical study using the quantitative method and data collected through a questionnaire, answered by 169 Portuguese family firms. The survey design was based on prior research of FB performance and the F-PEC questionnaire. The exploratory factor analysis and multiple linear regression models are used. Findings – The results indicate a negative relationship between experience and financial performance, a positive association between a culture of family commitment and performance (financial and non-economic goals), and a positive relationship between a culture of family values and non-economic goals. The r esults show the importance of agreement between the firm and the family goals. Family influence on FB performance cannot be seen only from a positive (stewardship theory) or a negative (agency theory) perspective . Originality/value – C ommitment increase s financial performance and the achievement of non-economic goals (perpetuity and family assets) . It is important to study how a culture of commitment leads to superior performance.