PurposeThe search for competitiveness by family-owned companies has led us to research topics that may help these companies succeed. The management of human capital is undoubtedly one of the keys to success, and the practices of employee development (training, promotion, succession, career planning, mentoring and coaching) help improve the performance of these companies.Design/methodology/approachThis paper is based on studying a sample of 560 family companies and analyzing the relationship between performance of the family businesses and the use of employee development practices. The techniques used were confirmatory factor analysis and structural equation modeling.FindingsThe results show that employee development has a direct effect on the indicators of performance in family companies. The authors have developed a series of practical implications for companies that justify investments in and efforts with regard to employee career development.Research limitations/implicationsFamily businesses need to understand the development needs of their employees. In addition, the very processes and tasks performed. The authors have developed a number of practical implications for companies that justify the investments and efforts made in employee career development. This work validates the usefulness of the use of certain practices for the development of employees in family businesses, allowing the company to generate human capital to build a competitive position in the market.Practical implicationsThe results of this study suggest that family businesses should understand the development needs of their employees and that various practices are available to help detect these needs. Family businesses should see individual development processes as an opportunity to improve the performance of employees, which could avoid conflicts in such businesses (Qiu and Freel, 2020). Companies should develop career and succession plans that enable these changes to be faced throughout the company, ensuring that when handover occurs, the candidates are sufficiently qualified in accordance with their career paths. The present research study shows that coaching is a powerful tool for improving performance. Moreover, mentoring appears to be an important part of employee development. For this reason, mentoring programs should be formally planned with designated objectives. In addition, family businesses should provide employees with real opportunities for promotion and the development of their skills and abilities, which is a way to retain nonfamily professionals (Ramankutty and Pujar, 2017).Social implicationsFamily businesses are a very important part of the productive activity of a country and their continuity is necessary to maintain employment and income. The management of people in family businesses is a key aspect for their success, therefore knowing the key aspects for the development of human capital will have a positive influence on maintaining employment and income.Originality/valueThis paper addresses the study of people development processes in family businesses and proves its usefulness to improve performance, considering the formal planning of succession processes and professional careers, providing qualifications to candidates and ensuring that they are show satisfaction with their professional evolution in the company. Likewise, it is positive for family businesses to use coaching relationships, formally scheduled and employing a coach from abroad. The other tool that will favor the development of employees is mentoring, formally programmed, establishing objectives and properly studying the mentor's profile. For this tool to be applied successfully, it is necessary to get the participants to commit to the mentoring process. Finally, the organization must provide its employees with real opportunities to promote, training them and developing their skills.