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.
About two months until Mother's Day. Wonder if it will be outlawed as ‘discriminatory’.