There is a place where the groom's brother stays with the bride for one night before getting married.

I don't think it is possible for the groom's brother to stay with the bride for one night when they get married. What are you talking about? How can there be such a rule? Doesn't that mean you've suffered? On the contrary, your brother took advantage and will stay with him for one night before marrying you. I have never heard of such a rule anywhere. This is nonsense, or they are having an affair. Would do such a thing. Under normal circumstances, this will basically not happen. If it does happen, if it's not your custom, it proves that they are having an affair. Otherwise, who will stay with others for one night before marriage? If it doesn't matter, others will be a little unacceptable.