I mean you can tell your brother you know about his affair and blackmail him to give you money and gifts but otherwise don't tell his wife because he was already your brother before she was your sister-in-law and your loyalty lies with him, he's your family. But yeah I'd totally blackmail him. Tell him to buy Lemonade on iTunes 50 times otherwise you'll snitch on him.
'stay loyal to your brother, he's your family!!!!!'
tbh, you should tell him you know. see his reaction, talk to him.
See what he tells you. Maybe they have an agrrement about it (I doubt it, but you never know).
And try to understand through his reactions if it's going to happen again (does he feel guilty?). If it is I would have demanded him to tell her. give him time for this, but she should know, prefely from him.
Was your sister really sick or are they in bad therms? I mean do you know what's hapening in his household?
Yeah, she was sick. i talk to her occasionally and if they were fighting I would've known. They're both LOUD and it always ends with her cursing him out and him doing the same.
Happiness is an illusion 99% of the time anyway. If the family, and especially your sister in law, seems genuinely happy to you, I'd say let it be. What she doesn't know can't hurt her.
If they didn't have a family, I'd tell you to go for it and expose him, for her sake, but now... it's really different
I agree with everyone that told you to confront your brother though. Not sure it will help him / them, but it will help you and get some of the burden away from you, so
1. collect evidence (you should've snapped a photo or recorded the audio)
2. confront him and threaten to tell your mom if he ever does it again, for the sake of your nephew/niece
3. tell him to come clean
4. track the woman and ****-shame her into leaving your brother
5. come clean with your brother and tell him you will keep the secret (bro before hoe) or
6. drop hints of his lil hook up in front of him (make sure his wife is nearby), once he's caught on and confronted you, threaten him and use the secret as leverage to get what you want
knowing you, no 4 and 6 would do the trick. good luck
Do not ****ing tell her omg, they have kids......
But do confront him and make sure that it is a one off thing and that your disgusted and disappointed in him. Telling his wife won't do **** for her or her kids.
P.S. you really should have confronted him and that bitch when they were having sex.... I mean :/