What do you say to someone on his death bed? I do not know where to begin. What do you say to his family?

My uncle lies in unconscious in ICU after an accident. He probably won’t survive the week. No one knows how the accident happened. Even his passenger, who only had minor injuries, had no idea. He was a safe driver.

He will leave behind a loving wife and 4 children, 2 still studying. What gets me most is watching his family members softly calling out to him, slightly tugging on him.. hoping he will respond. Somehow. Someway.

They never gave up for the past few days.

What can we do?