Humorous joke: Sister-in-law insists on treating me to jiaozi today. What does that mean?

Maybe my sister-in-law wants to treat you to delicious food or share her hobbies with you. However, please note that sometimes, people may have some special intentions. For example, eldest sister-in-law may want to tell you about family affairs or ask you something. If you are confused, you can communicate directly with your sister-in-law and ask her why she invited you to eat jiaozi, so that you can better understand her intentions.