She realizes she can't have her sister and her boyfriend living there anymore so she kills them both and hides the body in the grandmother's room (where the other dead ones are).
After the last 2 murders, the movie revolves around Ethel trying to get rid of the bodies, she tries a few things but they don't work out til finally she does something very disgusting and horrifying, I won't say what it is but it was something that she should of done a looong time ago since she's a fatass. The movie was weird but funny, I was pretty much entertained through out the whole time so I'm glad it wasn't boring at all. If you want to see a movie about a fat woman killing people, then check this movie out but don't watch the sequels because apparently they're terrible and not worth it. 7/10.