Hello Aman,

Unfortunately it's not possible to stay with your sister in hostel as in India, it's not yet available for both the genders to stay in the same hostel room, be it siblings or friends. You will have to stay in boy's hostel as both the genders have different hostels. Even if they allow you to stay with your sister, it can become uncomfortable for other girls which is my you won't be allowed to do this.

Hope this helps,

Thank you