I'm going to give a dissenting opinion when asked about how I feel about my grandparents' will distribution
Was their will distribution unfair to you?
No, but I could feel my father's frustration when he was talking to other relatives about the will.
People will often have their own opinions, especially about sensitive topics like this.  However, since no harm has come to you, it's probably best for you to try to maintain harmony, instead of raising arguments just because others were frustrated.
Really, why do we even have to respect the will? They are dead so why should we care about they wanted.
Since you have no stake in the situation, don't you think it would be better to just stay out of it? If your father has issues with the will, shouldn't he bring that up himself if he wants to? Otherwise, you might just be causing unnecessary drama.