On the other hand, it is true that your grandfather is seriously ill. Everyone has a sign when he leaves this world, and I also have a sign when my mother leaves.
But the exception is you. In ancient times, people with heart and courage were afraid to go near. That's probably who you are. In your dream, your grandfather was taken away, and you are not afraid, which shows that you are very open-minded in reality, at least you have done nothing wrong. If you spend more time with your grandfather, ghosts will not be able to get close, which is of great benefit to your grandfather's health.
After this, we should do more good deeds, that is, do good deeds and not do bad things, so as to make up for our luck.