Family.

Question :  " What will be the influence of the communist order of society on the family? "

Answer :  " It will make the relations between the sexes a purely private matter which concerns only the persons involved, and in which society must not intervene. It can do this since it does away with private property and educates children on a communal basis, and in this way removes the two bases of marriage up to now -- the dependence of the wife on the husband and of the children on their parents resulting from private property. And here is the answer to the outcry of the highly moralistic philistines against the communistic "community of women."

Community of women is a condition which belongs entirely to bourgeois society and which today finds its complete expression in prostitution. But prostitution is based on private property and falls with it. Thus communist society, instead of introducing community of women, in fact abolishes it. "

- Frederick Engels, 'Principles of Communism'