The purpose of this qualitative, comparative case study was to understand the relationship between business models, strategy planning processes, environmental factors, leadership, and the influence on sustainability in three private, multi-generational, family-owned businesses in New Jersey and Pennsylvania. Twenty executives were interviewed to gain insight to the qualities of the business model that led to sustainability beyond the first generation. The critical component to sustainability was identified as family values and continuation of the family. The findings revealed the importance of implementing an appropriate strategy planning process, establishing an advisory governance board, understanding the maturity level of the industry, acquiring industry knowledge, and establishing relations with suppliers and customers; elements of the Sustainable Family Business Model.