How to write the reason for grandma's death and leave?

Grandma's reason for leaving can be written like this:

Dear leader/teacher, I am writing to ask for leave, because I have unfortunately received news of major family events. My grandmother passed away recently, which was a great blow and grief to me. Grandma has always been the closest and most concerned person in our family. She gave herself selflessly and gave us endless love and support. Her death made me feel deeply sorry and guilty. In the face of such a family event, I really need to stand up and support the funeral arrangements and various procedures. This is a time to pay tribute and say goodbye to my most loyal care. Please approve my application for leave, so that I can go back to my hometown and spend an unforgettable and difficult time with my family, and attend the funeral ceremony and other relevant arrangements at an appropriate time. The estimated vacation time is (specific vacation date). I am deeply sorry for the inconvenience, but I believe you can understand and support my decision. If you need to provide any further information or documents, please feel free to let us know. Thank you.