Bina is the daughter of Mohan who is the only son-in-law of Meena. Meena has only one child. Kiran is the granddaughter of Meena. How is Kiran related to Bina?

Meena has one child, whose husband is Mohan (her only son-in-law), and Bina is their daughter, i.e. Meena's granddaughter. Kiran is also Meena's granddaughter, so Kiran is another daughter of Mohan and is Bina's sister.