I believe a parasite has to be a different species.
A parasite is defined by his function
He robs his victim of assets (like a tapeworm or a tick on a dog) and gives nothing in exchange.
Very few relationship are exactly equal... Children do take resources, but in a natural society they give back to parents in their day... We simply cannot expect to give them a world in which we are sullen and resentful slaves, and then expect them, with no better resources, to care for us in old age... We can only leave for them the situation we find for ourselves, and only an idiot would call what we suffer: Freedom...
To spare children this life is a kindness, and to subject them to it is a crime... And what should be our reward for introducing them to the unequal relationship of life, to a relationship too far gone to do anything but rob life from our whole nation??? That is what failed relationships do: They Steal Life from those within them, and give them as little as possible to keep them alive...
Much as people fear change, and fear to change their relationships, they sometimes must, and if we do so we will earn the praise of future generations and if we do not we will as surely earn their contempt...We cannot expect from the true parasites any sense of balance... They never think that one more drop of blood will kill their host, and usually it does not... It is because of weakness that the infested die, because in their weakness they have no resistence... If we could be a free and equal nation and are instead a nation of slaves we will not be strong enough to defend this place even when to do so is to defend our slavery for our slavery is our lives... We will not be the first society to collapse under the weight of slavery, and will likely not be the last...