Is OTHER wrong in the post ? POST : This happened a few months ago but looking back I think I need some outsiders opinions. 

My grandmother went to the hospital because she wasn't feeling to well. A few hours later she called the house phone and said she was staying the night and wanted my older brother to pick her up because she wouldn't be able to drive herself home. She told me that I needed to tell my brother this, which I said I would. Next time I saw my brother I said,  "Grandma is staying at the hospital overnight, she's going to call in the morning so make sure you're here when she calls" he said okay and that was that.

I wake up at around 11 AM and my brother was still home asleep and my grandmother had already called. His bedroom is not in a place where he could have heard it from the home phones location and he didn't even bring it to his room so that he could have heard it while asleep.  I call her and she's pissed but she had a friend come pick her up instead. To skip a bit ahead, she gets home, goes off on him and he tries to put the blame on me, saying that I wasn't specific enough and that I said didn't tell him that *he* was the one who had to pick her up. I don't even have a drivers license so I don't know how he thought I could have done anything. In the end, she's mad enough to kick him out of his house (He's 23). I don't feel like I'm the one in the wrong here, but I don't know. AITA?