I've been asked if AEPhi is a local, a "little sister" group for AEPi, and an alumnae group for Alpha Phi (!). I was even asked when AEPi had gone coed, because apparently people at an engineering school can't tell the difference between pi and phi.
My new member manual included basic info on all 26 NPC sororities, but we weren't required to learn it - it was presented more as "AEPhi is under an umbrella organization called NPC, and here is some information on the 26 member sororities, in case you're curious".