Yeh Rishta Kya Kehlata Hai: A twist to take place during Teej celebrations

In the serial Yeh Rishta Kya Kehlata Hai, Teej celebrations are in full swing. Here, Seerat and Kartik are celebrating teej together for family's sake. A big twist will shock Kartik's family. What is the twist? What will happen when family finds out about Kartik & Seerat's fake marriage?