Grandma died, how to comfort my mother?

Don't be sad. My grandmother died, and my mother was very sad. But my mother wants to forget it in the future. I said to my mother, let's not be sad. It's no use being sad. Maybe my grandmother went to a place that will never be painful. My grandmother is watching us from the sky. We should live happily. Then my grandmother is useless in the sky! Don't be too sad, because your grandmother is watching you in the sky! Grandma must also hope that you are happy every day. Otherwise, she will be unhappy in the sky! The dead rest in peace! I express my condolences. Relax. I don't know if you can listen.