How to comfort a middle-aged man who lost his son?

How to comfort a middle-aged man who lost his son? It doesn't matter what outsiders do. You can erase everything from a child, but you can't erase the memory from his heart. Persuade slowly, people can't come back from the dead, and no matter how painful they are, they can't change the reality. What outsiders can do is to accompany and comfort. If possible, let him vent it, and it's even worse to hold it in your heart. Time will repair the wound in his heart, and it will get better gradually. Let her vent her emotions. After all, there is no pain like losing a child, but we should enlighten her afterwards and have the courage to continue living. She is quite serious, and then I suggest that it is best for her family to take her to a professional psychological counseling institution for psychological counseling. I hope my answer is helpful to you.