Mungilal (Anupam Kher) was once a small time Bhai way back in 70, in Mumbai. He had a childhood friend Jignesh (Satish Shah) who was his friend cum business advisor. When the law-enforcing authorities turned the heat on the Bhais in Mumbai, Moongi and Jignesh fled to Bangkok. Now in Bangkok, Mungilal has become a don.
Film begins with the AABM (All Asian Bhai Meet) in which the agenda is to discuss and assess the falling sensex of Bhaigiri in Asia. In the discussion, a rival Don of Mungi's, Fursat Lala (Gulshan Grover) proposes an ambitious plan for a piece of land in Alibagh and puts across a valid argument that start in the business of Bhaigiri, it is very important to have a waris. Since Moongi has no waris and no plan for the development of that land, it is only logical that the next man, i.e. Fursat Lala should be made the new Don of Mumbai.
Moongilal assures the syndicate that he has a better plan and that he even has a waris, who he will present before the syndicate and asks for a one month's time to do the same. He is granted this much time in view of his past services.
Livid with Moongi on these lies, Jignesh asks him the logic behind this false statement that he has a waris, while he has not even married. Mungi reveals his noble plan to build a hospital on that land because in his childhood his father died at that place for lack of medical aid. And he doesn't want a casino there.
Moongi and Jignesh find a letter of Moongi's estranged sister Angoori (Bhavana Balsawar) whom Moongilal had thrown out years back because she wanted to marry a music teacher instead of a dreaded goon Happo Hakla.
Letter reveals that Angoori gave birth to Kamal. This child, who looks like mama Moongi, smiles like him and ever has a mole on his right thigh just as mama has one his. Mungi is thrilled and resolves to hunt his waris in Mumbai where he comes across a Peter Sellers like detective Johnny English (Satish Kaushik) who promises them to find Kamal, the waris, in 20 days. In return, Mungi promises to pay 50 lacs to him if he finds Kamal for him.
Through his weird ways, Johnny English gets hold of an NRI (Sammir Dattani) to stake a claim to be Kamal. He would put across to Moongi that he just wants his dear mama (Moongi) to touch the ashes of his mother so that he can submerge them in Ganga, before he goes back to Canada. Johnny takes him to Bangkok but, to his shock, he finds another guy (Shaad Randhawa) there, who also claims to be Kamal. To Johnny's horror, this new Kamal there, who is actually a struggling actor, used to live in his house in Mumbai as a paying guest. When Johnny attempts to call his bluff, this sharp-shooter convinces Moongi and Jignesh about the intimate details that could only have been known to his supposed mother Angoori (Moongi's sister).
While this confusion is on, one more girl, Shivani (Aarti Chhabria) arrives at the scene claiming her to be the real Kamal (because of the name Kamal, the gender was not clear in the letter). A confused Moongi asks all of them to stay in the house till he arrives at a decision as to who the real Kamal is. In the ensuing drama enters the second girl Jiya (Shama Sikandar) who claims to be a girlfriend of the NRI Kamal. The Picture brought by her almost convinces everybody that the NRI Kamal is the real one.
But it was not to be because of Mungi's dangerous ways of testing their authenticity. One day he compels them to confess that they are all impostors and are here to make a quick buck. They plan to run away with this old man's riches that night. But while they are in the process of stealing the money, the truth dawns upon them that he is not any cynical old man, but a dreaded Don.
Now all four are caught up at the Bhai's house and how Moongi, then, makes them to act as his waris?how his rival Fursat Lala unveils the truth? is a journey through hilarious situations.
Is one of them the real waris? Does Moongi get to make the hospital? All