If it makes money (or some equivalent) then you can’t own it. Parents aren’t necessarily, if you’re supported so that you can invent for the betterment of society or for fun.

Dictatorship of the proletariat is supposed to be a temporary phase, but it is a fundamental weak point in the transition to communism that I think cannot be overcome, because once people get that power, they won’t be able to give it up (or they’ll be removed by people who don’t want to give it up).

So I consider communism sort of an unattainable ideal that we should strive towards rather than actually considering implementing irl.