That depends on your relationship with your sister and your brother-in-law, and whether your sister is alone or with her husband's family! China people pay attention to etiquette and can do whatever they want with their eldest sister, but after she gets married, it is not her own business. You have to show your brother-in-law and even his family what you do. Whether you do well or not directly affects your sister's face and status between your brother-in-law and even your brother-in-law's house. I wonder if you can understand what I said! Simply put, I want to buy it, and I want to do everything I can to give my sister a long face. Don't leave a handle on your sister in front of her husband's family in the future!