She continues with hardly a pause. "My father, Edwin VanCleef, built this Brotherhood from the remnants of Stormwind's abandoned populace. My duty—and yours—is to ensure that the Brotherhood does not fall again. Although I'm certain that you've come here to join the Brotherhood, I will need a small amount of proof that your goals align with ours."
Wait to find out what this "proof" entails. Alternatively, just ask.