This paper employs an inductive case study to explore the relevance of the family functions in the opportunity creation process by immigrant entrepreneurs. We employ the perspective of the opportunity creation process and the family functions for theory building purposes. We conducted four cases of immigrant entrepreneurs who established businesses in Sweden and that have their origins in Lebanon and Syria, Cameroon, Mexico, and Syria. The paper identifies three family functions -- or family ways of working -- facilitating the opportunity creation process: (I) changing family roles, (II) family (acting) as a springboard, (III) family (acting) as trusting bedrock. These family functions were not static features rather processes influencing the opportunity creation process. The functions were connected to a specific opportunity creation process in the same order: (I) the triggering process, (II) the exploration of an entrepreneurial idea and (III) the exploitation of the entrepreneurial idea. The family functions changed as needed during the opportunity creation processes. Such change was however limited to the pool of resources available to the immigrant entrepreneur and the family in the home and host countries.