A man loses his parents, he is an orphan.
But when a parent loses a child, there is no word for it, and there shouldn't be. Parents shouldn't have to bury their children. You can't really put that pain into words.
I am imagining that repairing the human heart may somewhat look like repairing a broken automobile.
You put everything apart. Cut through thick flesh, or bolts. Shred it well enough, and put it back together.
But broken hearts really stay broken forever, don't they? How do you mend a broken heart?