When Archana Puran Singh inquired whether Ranbir assisted in changing nappies, Alia acknowledged that he did and added that he had also learned a Malayalam lullaby for her. "He does." He now sings 'Unni Vava Vo'. It's a lullaby. Our nurse has been singing it to Raha since she was a baby. It's in Malayalam. So when Raha wants to sleep, she says, 'Mama, vavo, Papa, vavo,' which is her cue to fall asleep. "Ranbir now knows how to sing Unni Vava Vo," she said.