Venture capital as well as family firms are very heterogeneous populations of firms. Extant literature has studied the interaction and connection between the groups of firms. However, only recently, researcher began to look at those firms which are part of both group at the same. Firms which are labeled venture capital family businesses (VCFB) (Ljungkvist & Boers, 2017). Recent research suggests that the interaction of family firms and VC firms can be distinguished into three separate phases (Schickinger, et al., 2018). Based on these phases, the paper develops propositions on how VCFB firms develop their professionalization trajectories in these phases. Thus, the presented propositions highlight how the family owners’ actions and behavior are related to professionalism and how it influences the three phases of investing.