Caring adults should adapt our suggestions to fit the age and maturity of the individual child. A special section about teenagers adds insight for that age group. Caring adults who try to 'fix' or 'solve' a child's grief will be frustrated. Their good intentions will not work. Instead, caring adults need to honor and support the child's grief.
Death is an event that leaves a permanent hole in a child's life.
It cannot be fixed. Allow the child to grieve. Be available for the child. Do not set a time limit on grief. Encourage them to share.