As hard as grief is for an adult, it can be especially challenging for a child. It can be confusing. When I work with kids & family who are grieving, I talk with them about happy memories, fun things they did with their loved ones.. I normalize their feelings. I talk with them about creating rituals around remembering their loved one. It could be cooking a favorite food, hiking in a favorite spot, watching a favorite show/movie & so on. I share my experience of losing my grandfather when I was 10 years old or losing my grandmother as an adult. One of my favorite memories of my grandfather is when he would dance with my grandmother while singing a song. His love for her was amazing. One of my favorite memories of my grandmother is her cooking. She always had a coffee cake in her freezer & would pull out 2 pieces when she knew either my mom, sister or I were coming over. My grandmother was an amazing cook & I am happy when I am making her recipes.
I have included some great articles about grief as well as links for some great books & journals for children.
https://childmind.org/article/helping-children-deal-grief/
https://kidshealth.org/en/parents/death.html
https://www.focusonthefamily.com/parenting/your-childs-emotions/how-to-help-your-child-grieve/how-to-help-your-child-grieve
https://www.amazon.com/Best-Sellers-Books-Childrens-Death-Dying/zgbs/books/3125