Reddit mentions of When Someone Very Special Dies: Children Can Learn to Cope with Grief (Drawing Out Feelings Series)

A couple other books to recommend for this age - Always Remember, The Memory Tree, The Invisible String, and Cry, Heart, But Never Break. There's a new one called Death is Stupid that might really resonate with him, but I'd preview it first. You can also try a kids grief activity book like Help Me Say Goodbye or When Someone Very Special Dies.

Awesome! I work more with PTSD rather than grief, but it often overlaps. I imagine you'll be getting training prior to starting with whatever assessment tools your agency uses, but I recommend reading up on TF-CBT, which is a great modality for trauma treatment with kiddos. I also really love this workbook for grief. My agency has a scanned copy so we can just print it off when necessary, so if yours doesn't have this I really recommend buying it and scanning the pages!

Hope this is helpful :) Good luck!!