My mother didn't really have an opinion about the greek system, as she went to school overseas. She came to see how much my sorority means to me, and to this day keeps an eye out for cute lily-of-the-valley and giraffe stuff.
My dad, however, is vehemently anti-greek. I found this out the hard way when I told him I was rushing. Turns out that he rushed at his alma mater ~50 years ago, and some of the fraternities hazed, so he figured all GLOs haze and that I would be made to drink a lot and get my fat circled.
(This is the same man who wouldn't let me apply to a certain university because they had a gay community.
) I informed him that I was pledging regardless of what he said. He's met some of my sisters, and I think he's a little happier as a result - though still not thrilled.