Grandma is gone, but she is very nervous about her study. How to take care of grandpa?

Seize the present time, talk to grandpa, chat with him and take a walk. Avoid the topic of grandma and cook something that grandpa can eat. Find out what kind of hobbies grandpa has, such as playing chess, going to the opera, or something else. If appropriate, you can share your hobbies with grandpa in person. In short, I believe you will have better actions.