Sidhant Rai a successful architect lives with his three kids Rohit, Rahul and Rani in a palatial bungalow with their pet dog Caspar and family butler Banke Bjhari Chaturvedi and of course the villainish uncles Vikram, Prabhakar and brother-in-law. Sidhant arranges for a governess to look after them, as their mother is no longer alive. But the kids are so naughty that they drive away every governess or master hired by their father. Sidhant needs to go away for a project but before he leaves he arranges for a governess. On the other hand Shekhar a small time thief robs a bank and hes is evading police when he sees Anna who is on her way to Sidhant's house for her job as a governess. He falls in love with her instantly and even manages to convince Anna that he knows her and confesses his love. Anna is in a state of shock when Shekhar's friend Jaddu covers for him by telling her that she resembles his ex-girlfriend. Anna meets Sidhant and is introduced by him to his children. There began a series of pranks. Kids scare Anna and she in turn with Sidhant plays the same trick on them. Shekhar on his front keeps confessing his love to Anna and proposes marriage to her. Kids play a crude prank on Anna by mailing her a telegram informing her parents death. Anna is hurt by the prank, as she is an orphan, kids realize their mistake and accept her as an elder sister. Anna too confesses Shekhar about her love for him. And the kids and Sidhant decide to get her married to Shekhar. However, Shekhar is arrested on the day of the marriage and Anna heartbroken leaves the house. Sidhant and kids set to get her back but they meet with an accident in which Sidhant is killed. Now the uncles claim for their share in the property when a strange character claiming to be Sidhants brother comes in. He is actually Rajit Rai who left his house when he was eleven. He is none other than Shekhar and he wins back the confidence of Anna and the kids. In this way Shekhar, Anna, kids and the butler save the fortune of Sidhant Rai from the greedy relatives with the help of a real yet unreal "RAJU CHACHA".