A lot of people assumed we were AEPi's sister sorority. A lot of my sisters did hang out there, some of them dated brothers, one of my sisters was lavaliered, we had summer rush parties with them, etc. - the groups were close, but not a brother/sister type thing.
When AEPhi first colonized, I got questions like "Oh, when did AEPi go coed?" and "Oh, so you're a little sister of AEPi?" You would think that at an engineering school, people could tell the difference between pi and phi.