Scientist Siddharth(Sharman Joshi) is given "Ma Kasam" by elder brother Harsh(Sanjay Suri) to bring her along for his wedding with Aaliyah(Chitrangada Singh) to be held in Mauritius. Their mom(Shabana Azmi) is least interested in attending the wedding because Harsh is getting married against her wishes. Dad(Boman Irani) and Siddharth succeed in bringing mom to Mauritius where Aaliyah is Siddharth