I let my grandmother know that I was having a girl over tomorrow while my mom was out of town. She said she was okay with it, and that she liked the girl enough she would even let the girl stay the night (I mentioned I wasn't asking for permission, just informing her. Also the girl wasn't able to stay the night.). Just a few minutes ago, my grandmother came to my door to ask me a favor -- to not mention that she was okay with the girl staying over for the night to my mom. I asked why, and she said my mom would be mad at her. I pretended I had no idea why it would be a problem until she left.