Very sad. I cannot imagine what it must be like for a parent to lose a child.
I know what its like. Believe me, its enough to drive a person insane.
That must be absoute despair. Thankfully I have not faced anything like that but I can imagine from lesser tragedies I have experienced that one can torment onself with "What if this?" and "What if that?" and "If only this" type of questions and it is very hard to break out of that type of thinking.
So do I, and you are spot on. You are a broken person until the day you die.