I think this is pretty difficult since your brother and your wife are both people you are supposed to be able to trust implicitly. I think he has to communicate with them both, and find out why. There are a lot of questions, like is his wife even wanting to stay in the marriage, is she prepared to be faithful etc. Then of course you get the difficult thing of whether he is ready to forgive her/able to move on.

It should only matter if she really lied to him. He doesn't know that- I agree that he should speak to her. Sports and stuff could actually be to blame. To hold a family meeting, send her away, etc- Bizarre! They are married, they have made vows. You should try and stick to them for more than 12 hours. If he wasn't a virgin and she wasn't a virgin, then the only problem is that she didn't tell him. Communication should be a priority.

I think BBN will be a cool experiment. Maybe you'll find that your fellow Nigerians are cooler and more exciting than you expect. You never know what people will do when you put them in a situation like that.