<p>I think you should mention it. My dad’s cousin was the first woman professor at Yale (my son is applying). I never thought of it until reading the last post. Should he mention it?</p>
<p>If your sister having gone there genuinely made you interested in the school, then sure, that would be good to include to demonstrate your interest.</p>
<p>In the “why Northwestern?” essay on the supplement, I mentioned that several of my relavtives had attended NU and that my grandfather had taught there. I was accepted, so it can’t do any harm, I guess.</p>