I am the only Greek in my family so there are no greek unions. As for Sorors I know who are married to other Greeks I have a linesister who is married to a Bruh, 9 Sorors in the Alumnae chapter I just left are married to Bruhs and one Bruh I am very close with is married to a SGRho. All in all I would have to say many of the Greek unions I am aware of are with Sorors and Bruhs.