Nuclear family is indeed a recent development and started with industrialization and modern capitalism. While we use the same term, 'family', to refer to (pre-)

Nuclear family is indeed a recent development and started with industrialization and modern capitalism. While we use the same term, 'family', to refer to (pre-)historic forms of family, too, those family types had little or nothing in common with the modern definition, when it comes to power, inheritance, law, sex, love. https://en.wikipedia.org/wiki/The_Origin_of_the_Family%2C_Private_Property_and_the_State#Development_of_human_society_and_the_family https://en.wikipedia.org/wiki/The_Origin_of_the_Family%2C_Pr...