Ignoring for the moment the argument that the grandmother may well have paid a load of taxes before getting alzheimers, one thing that would seem fundamental is

Ignoring for the moment the argument that the grandmother may well have paid a load of taxes before getting alzheimers, one thing that would seem fundamental is that the grandmother gave birth to a parent of the carer, without which the carer would not have existed at all, so how can the grandmother be considered a parasite?