Original Commentary
Yep. Veronica and Sandra can tell them apart. Emily, Brisbane, and Kimberly can't. I think the rule is that if you weren't in Unlike Minerva, you can tell which brother is which - Terrence

edit: No, Brisbane can tell them apart. Heck, I wrote that comic. - Terrence

Modern Commentary
Can Emily tell them apart? I mean, on some level I'm sure she's noticed that there's the one that she likes and the one that likes her and they aren't the same...

Why is she here? Because she'd get bored at home and she likes parties - Terrence