I saw my brother-in-law walked in a hotel with a young woman, what should i do?

Tell your sister immediately, so that she can wake up from her sweet dream, it is very likely he is having an affair with a lover, instead of just a one night stand or becoming a John for a day of personal indiscretion; base on your observation. If you are interested in helping your own sister, then it is the time to do it now, to get her ready to deal with a cunning husband that cheat on her.

If you ask me, it may sound harsh but I think you should beat the crap out of him and told him to make this over and that it's gonna be left between you too. Pretending you didn't see nothing is the worst thing you could do if you ask me. Do you think your sister deserves that ? I have sister too and I can get in to your situation and that's what I was gonna do if it happened to me. I hope it didn't. Good Luck !

I think it would be better to talk to your brother in law first. Tell him that you saw him and see if he will confide. Of course, most guys will deny but if you could convince him how you caught him may be he'll confirm. Then ask your brother in law if this affair has been going on, because it is your sister he is cheating and this behavior should not be tolerated.

I would've have called her & had her come to the hotel, and find out for herself. then you're just a spectator. That IS really rotten though!! I hope she takes him to court and gets child support.

If you care about your sister then tell her that you saw him with a young lady going in to a hotel.

I would have a word with your brother in law. After all your sister has a small baby and this is a terrible time to break the news to her. Discuss it with him - find out if he is having an affair initially. Ask him what he is going to do about it. and take it from there

If it were my sister I would tell her what I saw. I might go to the brother in law first and tell him I saw him and if he doesn't tell my sister I will.

That's really hard situation. On your place I would be loyal to your sister. She deserve to know. Would you like to be with a liar? She deserve to have normal life. And this man if he got affair he is not worth her. I wish you all the best.

I feel sad to hear this . I think you should certainly divulge this to your sister as well as your family . This is the way you can save your sister from her cheating husband .

OMG he could be cheating!!! You should have approached your brother or ask him when you guys have the time.

don`t even ask is your sister that matters...just tell her the truth she has to know