AEPhi does not have an official "sibling GLO". The founders didn't have any help writing their ritual (that I am aware of).
At many schools, AEPhi and AEPi are unofficial brother/sister orgs... similar letters, both historically Jewish, etc. The AEPis at my school gave my local sorority's founding sisters a lot of help getting started (though we didn't call ourselves Sigma AEPi
).
What irks me is when people think AEPhi is AEPi's little-sister org... um, AEPhi was founded first
