NEWS DESK: Karan Johar was one of the newest celebrities to become a proud parent to twins - Yash and Roohi - through surrogacy early this year. The director and producer now reveals how his life has changed since the arrival of the twins, reported Times of India. Talking about his children, the filmmaker said that they have made him a far more responsible adult. Moreover, he revealed that he finds himself more anchored and that he now has "a mission" in his life, thanks to Yash and Roohi. Karan also said that right now taking care of his mother and the twins have become more paramount to him than directing films. When asked whether he would write another book, Karan brushed it off saying that it would take him twenty years for that. On the professional front, he is all set to work on the next season of his talk show apart from producing an interesting lineup of films.