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I didn't downvote it. But the closing line about Marxism seems both dubious and, at most, tangentially relevant.

It is accurate, based on both The Communist Manifesto (1848) and The Origin of the Family, Private Property and the State (1884).

Can you offer more specific citations -- say, to particular passages?

The relevant passages are far too long to quote here.

I suggest reading chapter 2 (starting at "Abolition of the family!") for the first, and chapter 2.3 and 2.4 for the second.