My grandfather died of lung cancer, but I was not as sad as I thought.

It's normal for people to die. You cried when you learned that he had lung cancer. After a period of time, you have accepted this fact and made preparations. Some things have no ability to change, so we have to accept them. If we are always sad about this matter, we will not solve any problems, but only increase our own troubles, which is not good for us. As long as we are good to the elderly while they are alive, it is good to minimize their suffering. Even if we are good to ourselves, we are good to the elderly.