No offence, but I think people are reading too much into a simple street scene. You could interpret this in many different ways.
For instance, the woman on the right is walking her blind sister down the street. The blind sister on the left has long dark hair. The sighted sister on the right is mid-stride - she doesn't have an orthopaedic shoe.
And if those are public toilets, why is the man on the left urinating in a gateway?
I'm not saying these interpretations are correct, of course, just that there are many ways of interpreting a scene.