My boyfriends oldest sister keeps spreading shit about my SO because she dislikes him, they never really got along so we avoid her. Found out today she's been spreading lies and rumors about him so people now want to beat him up? I know nobody will because it's all bs and everyone knows he's a good guy and she's always cried for attention, but I'm sick of it. How do I tell her to stop without saying anything that she can twist and use to her advantage?? Don't want her to try to turn his family against me, even though they have a good idea of how she is.