I found solace in your posts - my dad, who is nearly 90, has just been told he might have "2 hours, 2 weeks or 2 months" left, after a stent from a previous quad by-pass was found to be almost completely calcified.
He's old and sick, but it's still hard to take.
To hear that you and your boys were there with your mom gave me the courage to plan for the same for my dad.