This afternoon I was at home with my brother. The doorbell rang and he answered it. He comes to me and tells me someone (a teenager, I'm guessing from appearance) is at the door. He doesn't know her, which is a red flag since my brother knows practically everyone in the neighborhood, so if he doesn't recognize someone then they more than likely don't live in the area. We were expecting someone to come by around the time she showed up, but she's not with them. It turns out, she just wants to use the bathroom. I tell her, sorry, I can't let you use the bathroom and that's about it.
We live in a suburban area, so it's not like people just pass through, especially on the road we live on. (If someone is passing through, then they're either lost or being suspicious).
What would you have done in this situation? I feel like I should've asked her if she lives nearby, but even if she did, I wouldn't let her in and it would've just been more awkward than it already was.