ABSTRACT The article compares family small and medium-sized enterprises (SMEs) from Germany and Sweden with a large family company in their work on corporate social responsibility and sustainability. This study aims to understand how and why (small) family firms work with sustainability. In total, 14 interviews were conducted with family firms in different industries. Large family companies are a benchmark, as they have worked with these questions since 2000. However, family SMEs also work with these issues. It is the family owner-managers who actively work with these questions. Accordingly, findings are of relevance for family firms and their managers, working with sustainability.