For example. Just had sex today. You can report a lawsuit to the court immediately. Tell your husband's brother and your mother-in-law to let the forensic doctor test DNA first, so that there is evidence. There is another premise. If you find out, you will take your husband's brother and your husband's mom and dad to catch the rape together. Divorce and property division.
If you don't want a divorce, then you can sleep with your husband's brother. After going to bed, tell your husband that I did what you did. It's up to you. You can hint at Doby, your husband's brother, and tell him clearly.