If Fredo had any idea that there was a 'grace period' which expired the day his mother died, he would not probably not even have appeared at the wake. He was not the type of person to have 'resigned' himself to the thought, 'Oh well, no way out of this, I screwed up, I'm toast anyway so I may as well just sit around and wait for the big one'.

If he had even the slightest inkling of what Michael had in mind he would have kept running as long as he could...the way he did that night in Cuba. Like the selfish, whining coward that he was. He may have been caught up with eventually, but he would not have simply walked into Michael's hands. Not if he knew what was gonna happen.

Fredo didn't know.

Apple