Why is Ranbir Kapoor not denying having twins?

After all the rumours and strong speculations, It looks like Alia and Ranbir are definitely Expecting twins. Ranbir is on a promotional spree as he is promoting his film Shamshera. During many interviews, he was asked if he and Alia are expecting twins. Ranbir went for an indirect answer and not answered the question as well. He has not yet denied the rumours.