To Guard Against What?

Sigrid said, "I will! By the way, tell me about your brother and sister-in-law. I'm really curious about how they ended up like me."  Rachel said, "The last time I went back to my parents' home, I found that they were still so reserved after getting married for so long. My sister-in-law ignored my brother in private. He thought that if he married you, it would be over. I didn't know that he would beat you like your husband!" Sigrid said, "What you're saying is a little different from what I remember. I don't remember being slapped?"  Rachel asked, "Don't you remember?"  Sigrid replied, "I remember some parts of it." Rachel said, "Oh, alright. Anyway, I know you guys are quite fresh. How long has it been since my brother got married? There's still no progress! So, he must not have gone to ask for advice. Even after asking for advice, I still don't recognize him as my brother!" Sigrid said, "Okay, okay. Teach your brother well. Maybe he is a straight-laced guy who doesn't know how to cha