That seems to be a common thread for those like you. A Marxist believes in the supremacy of the state and the subornation of the individual to the state in all things, property, wealth, and even children. The idea that the state, or the "community" has primacy over children before parents is a very Marxist ideal and one that "any other Marxist" would also not be outraged over.
There are two major problems with this post.
1. "Marxism" doesn't mean what you think it does. Marxism calls for a
stateless society, not a society in which the State is supreme. "Marxism" has more in common with anarchy than anything else - and the state "having primacy over children" would NOT be considered a "Marxist" ideal in any way.
2. Neither Melissa Perry or I have put forth the idea that "the state" or "the community" has "primacy" over children before parents.
I'm most certainly NOT a Marxist. But I do know what it means.