Why did willmott and young believe the nuclear family became dominant?

Willmott and Young believed the nuclear family became dominant due to the social and economic changes brought about by industrialization. As people moved to urban areas for work, the need for a more mobile and self-sufficient family unit emerged, leading to the rise of the nuclear family structure. This shift allowed families to adapt to the demands of modern life, fostering greater independence and economic stability. Additionally, societal norms began to favor this family model as it aligned with the needs of a changing workforce.