Pharoah,
Actually, in your research you should have found out that there is only one NPHC fraternity that has a sister organization CONSTITUTIONALLY and that is Phi Beta Sigma. Though as Nupe said organizations may "hang tight" only the Zetas and the Sigmas are bound as brother/sister.
"Whether it's Sigma or Zeta, it's all PHI BETA!"
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Peace and Blessingz,
Zeta3_2000
zka Quiet Storm
#3 SPR 2000
Sex-Z Psi Epsilon Chapter
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