Björn's grandma leave him

I was chatting with Björn, suddenly got the news of his grandma's death.
She died 2 days ago, just before our mre exam and her funeral is this Friday.
I am shocked, I donot know how to comfort Björn,
i donot know what to say at that moment. I know Björn love his grandma so much,
he must so sad and pain these days.
I start to talk about my grandfa, i love him but he left me when i was in primary school grade 3;
I clealy remember that moment.
We were still talking, how ever he really make me miss home.
I feel scared to lose everyone who love me , who i loving, who beside me.......