My fiances grandma died they were really close, I met her just the day before she died, she called me beautiful in…

My fiances grandma died they were really close, I met her just the day before she died, she called me beautiful in Italian. It was a very intense moment because we knew we probably weren't going to see her again my fiances on the phone crying. I don't know what I should do to cheer him up because I've never really lost someone so close to me. My cousins in a home because he has a brain injury from his recent car accident but I feel that he's still there even though he can no longer communicate you can still see it in his facial expressions that he's still there. So how can I help the one I love's loss? any ideas?