Delta Gamma's "brother fraternity" (NOT REALLY--just closely historically related) is Phi Delta Theta! I did find it interesting, though, that the *broken* link to the article used to reference George Banta's membership in DG on Wikipedia is called "Brother Fraternity - Phi Delta Theta" at
http://www.deltagamma.org/brother_fr...ta_theta.shtml. Weird.
And yeah, whoever was talking about Pi Phi and Beta--I think their similarities are likely coincidence. Our colors were pink and blue, but we added bronze in recognition of Beta's shared use of the colors, but that doesn't make them our brother fraternity.