In this chapter, we define a family cult as a cult that either mainly consists of one family or a cult whose doctrine specifically defines or exerts control over the family structures of its members. We examine the unique dynamics of family cults, as well as the characteristics of leaders and followers of family cults by discussing six family cults: The Branch Davidians, The Children of God cult (later known as The Family International), The Manson Family, The Peoples Temple, The Fundamentalist Church of Jesus Christ and the Latter-Day Saints, and The Church of the Lamb of God. We explore the added degree of difficulty of maintaining loyalty to a cult leader above family, and the dynamics that appear in the resulting complex relationships. Future considerations include the redefining of family structure in the age of the Internet. As people develop connections with others across the world and the concept of family changes with time, it will be interesting to see the evolution of our concept of family cults.