As far as I know, the only official brother and sister groups are Zeta Phi Beta and Phi Beta Sigma, which are constitutionally bound. Other groups are related at some level; Sigma Kappa and Theta Chi have leaderships seminars together, and AXD acknowledges Sigma Nu's help with their formation. That doesn't mean that they are close to each other on any given campus. There are a few campuses with local Greek systems where there are official brother-sister groups, however.
If you were to come back to campus in 10 years, I bet your fratermity would be hanging out with a totally different sorority than it is today.
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Alpha Xi Delta
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