I suspect that our brains are not hardwired for this scenario, nor is an after-market add on available either. Job loss, ill health, end of a significant relationship, death of a parent or friend - I believe that for the most part, we are programmed with the capacity to process these life events. But the death of ones child? How is it possible to reconcile giving birth to this precious being, then day in and day out fully invest oneself in his growth, only to be asked to live without his physical presence years later. I would venture to say that being able to fully comprehend the death of ones child is likely impossible.
Of course, whether I fully understand it or not hardly affects the journey of living with this loss. Every day, every single day, it simply comes down to focussing on joy, love and gratitude as much as possible.