sil and ils are the real cunts. the problem was feeding them, giving them ammunition. cunts seek to instigate drama via provocations to have a 'claim' on you to create more drama. the moment your sil started backtalking you as if she was your nagging wife you should've walked away. don't feed the trolls, don't give them more ammunition. let your word drop and let it be final. you engaged with them and gave them more 'ammunition' and that's where you failed. say what you have to say and walk away, let it be final.
United States