In 2011, over four million Australians lived in multigenerational households where two or more generations of related adults cohabit. This accounts for one in five Australians, with proportions higher still in the major cities. This paper reports on the findings of a survey of people who live in multigenerational households in Sydney and Brisbane. The survey provides important information about how and why these households live together. The paper concludes with a discussion of the implications of these findings in the context of structural changes in Australian society and social and cultural views about the family.