My grandfather just died, and my dad's pretty devastated, obviously. Anyone any idea how I can comfort him..?

The best thing is to just be there and love him the same some people handles death good until it really hits them and when it does u will need to be there and just hold your dad. U can also try talking about the memories of your grandfather it may make him smile and cry but talking from mine own experience it made me feel better in the long run to have someone around that was not scared to reminisce with me. STAY STRONG ITS HARD BUT IT WILL GET EASIER