You should talk to your sister. Why do you want to steal business so badly? Why don't we make money together? What is your original intention of teaching your sister to do jewelry business? Why did she become like this later? You should sit down and talk it over. If your sister's character is bad, and she is mercenary, you should take some precautions to protect your design and customers. As you said, your sister sells 100 yuan, and the business is booming. You can do the same. Wouldn't it be better if there were more original design businesses?