It was Lenin, but the central thesis is not mistaken. The family was seen as a roadblock to the revolution since women, useful wards-of-the-state-to-be, were too busy caring for families to help the cause.

https://www.theatlantic.com/magazine/archive/1926/07/the-rus...

https://www.marxists.org/archive/zetkin/1920/lenin/zetkin1.h... (Probably in the "What About the Men?" section)

Edit: since I was downvoted, and since the Lenin interview is gold, I'll mine some for you... hopefully with enough context:

"I ask you: Is now the time to amuse proletarian women with discussions on how one loves and is loved, how one marries and is married? Of course, in the past, present and future, and among different nations-what is proudly called historical materialism! Now all the thoughts of women comrades, of the women of the working people, must be directed towards the proletarian revolution."