Share 'For the Tough Times'

I have a friend who lost his wife last year and his son last month. He feels suckerpunched, and of course, he was. He didn't see this loss coming. His wife's disease took her in a matter of months. His son was an alcoholic and his disease took him over a matter of years, but the end was surprising and unexpected. What do you say to someone who has experienced such loss? How can I be a friend?M...