What did Laslett estimate regarding the prevalence of extended families in pre-industrial society?

Laslett's research estimated that only around 10% of families in pre-industrial society were extended. This finding highlights the misconception that extended families were the norm; in reality, Laslett's work demonstrated that nuclear families were more common than previously thought. He defined extended families as those that included other relatives beyond the nuclear family unit, such as grandparents or other kin living together.

Laslett's data, drawn from parish records, challenged earlier consensus views by indicating that the majority of families were structured as nuclear, consisting primarily of parents and their children. This provides insight into the social structures of pre-industrial societies and underscores the variability in family types. In contrast, the other options suggest percentages or categories of families that do not align with Laslett's findings. For instance, the claim that nearly 50% of families were extended would overstate the prevalence of this family form, while asserting that all families were extended or that this was exclusive to upper-class families misrepresents the diversity and dynamics of family structures during that time.