Abolition [Aufhebung] of the family! Even the most radical flare up at this infamous proposal of the Communists.This is the kind of reasoning that is at the core of efforts like this. Even worse, Marx perverts the study of history in his treatise Origin Of The Family, which has been but one cause of the many perverted experiments of this day.
On what foundation is the present family, the bourgeois family, based? On capital, on private gain. In its completely developed form, this family exists only among the bourgeoisie. But this state of things finds its complement in the practical absence of the family among the proletarians, and in public prostitution.
The bourgeois family will vanish as a matter of course when its complement vanishes, and both will vanish with the vanishing of capital.
Do you charge us with wanting to stop the exploitation of children by their parents? To this crime we plead guilty.
But, you say, we destroy the most hallowed of relations, when we replace home education by social.
And your education! Is not that also social, and determined by the social conditions under which you educate, by the intervention direct or indirect, of society, by means of schools, et cetera? The Communists have not invented the intervention of society in education; they do but seek to alter the character of that intervention, and to rescue education from the influence of the ruling class.
The bourgeois claptrap about the family and education, about the hallowed co-relation of parents and child, becomes all the more disgusting, the more, by the action of Modern Industry, all the family ties among the proletarians are torn asunder, and their children transformed into simple articles of commerce and instruments of labor. …
— Communist Manifesto, Chapter 2
This is where Marx was fundamentally wrong. The family existed primarily for survival. After that, for surviving better. The better the family did, the more likely its progeny would continue, the more likely its genetics would survive and be passed on.
One of the essential problems with intellectuals of Marx's stripe is that they think they can overcome fundamental forces of nature (in this case the will to survive and procreate). Such essential delusions condemn their philosophies to failure, no matter who undertakes them.