Sister-in-law is ugly with athlete's foot and bad breath! I can't figure out how my brother married her. My parents don't like her.

It doesn't matter if you don't like her, mainly because your brother likes her. She lives with your brother, not your family. Since you are your sister-in-law, you should respect her and speak well of her in front of your parents at ordinary times, so that the family can be harmonious, the life of your brother can be better, the family can be United and twisted into a rope, and everything can be happy.