"You were his guardian angel" (351). I love how ironic the mom's reaction is. Common sense would say that if a teenager, came home drunk, that their mother wouldn't be very happy. So it should be needless to say that if a child comes home drunk, that the mother would be furious. So her reaction is very ironic. She thanks him, and says that he saved his father. So I'm assuming that this means that the father realizes he's been a bad influence and decides to never drink again. I'm also assuming that the father follows through on this promise because I think that the narrator would have mentioned it if his dad took up drinking again.