How are kappa alpha psi and alpha kappa alpha related?

"they are two of the black historical fraternity and sorority that were founded in January 1911." That is an incorrect answer! Alpha Kappa Alpha Sorority was founded January 15, 1908 and Kappa Alpha Psi Fraternity was founded January 5, 1911. Both Greek Lettered Organizations are primarily, though not exclusively, African American in their demographic profile. The thing that relates the two organizations is the fact that Lucy Diggs Slowe, one of the sixteen original founders of Alpha Kappa Alpha Sorority, and Elder Watson Diggs, the principal founder of Kappa Alpha Psi Fraternity were FIRST COUSINS and both were the FIRST President (Basileus/Polemarch) of their respective organizations' Alpha Chapter. Additionally, both were Educators and Grade School Principals. Other than these few factoids is the common knowledge that Pretty Girls wear 20 Pearls (members of AKA) and Pretty Boys (members of K-A-Psi) LOVE Pretty Girls! (LOL!)