If you are really going to get off a little by killin gtheir buzz I would suggest not rationalizing it.
Unless they are stupid they are not going to believe your rationalization . . tell underage people why they shouldn't drink you know?
I would just address the official aspects of the "little sister" group. If the girls want to hang out thats fine. If they want to meet or whatever as an interest group . . thats fine to. But the fraternity can't have any official relationship with them in terms of running them, having bigs and littles etc.
Another way to nip it in the bud is to have the girls form an interest group or even a club .. . that should transfer liability back on them if they decide to involve members of the fraternity in their governing in ways that are different from their constitution.
But don't expect the guys to be happy with you. Why should they want to break up something that works for them?
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