Originally posted by Don Cardi:
if Sonny were alive then the attempt may have been made on his life with a setup by Fredo.
If you are of the mind that a big part of the reason why Fredo betrayed Michael was jealousy and resentment of the fact that Michael was his younger brother and he (Fredo) was "stepped over", then there's no reason to think he would have betrayed Sonny as well.
Sonny, of course, was the older brother, and, as such, was always ahead of Fredo in the family pecking order.
Sonny commanded his own
regime, while Fredo was just a.....um, just a......
What exactly
was Fredo at the time of the assassination attempt on his father?
Anyway, there was no reason for Fredo to resent Sonny or feel any jealousy towards Sonny, hence, no betrayal.