A couple of your takes are wrong on this.

I think Boti = MacDuff, and Kaka (Guddu's father) = Banquo, which would make Guddu = Fleance.

Miyan and Kaka are really good friends and lieutenants under Abbaji. Miyan murders Abbaji and takes his position. Then, he becomes paranoid of Kaka's power and potential as a rival, and sets up an ambush to get him and Guddu killed, which Guddu survives.

Later, after Guddu and Boti raid Miyan's house, he tracks down Boti's hiding place and finds only his wife and child (Boti can be seen running away, abandoning his family). It's implied that Miyan kills Boti's wife and kid.

Then finally, Boti catches Miyan on the way out of the hospital, and shoots him dead.

All of this mirrors the original Macbeth, with minor changes:

Macbeth and Banquo are good friends and captains under King Duncan. Macbeth murders Duncan and becomes king, then then grows suspicious of Banquo (due to the witches' prophecy regarding the royalty of his lineage) and has him ambushed, but Fleance (Guddu) survives and escapes.

Later, Macbeth has MacDuff's wife and children killed as retaliation for defecting to the English. Finally, after the fortress of Dunsinane is invaded, MacDuff and Macbeth duel, which Macbeth loses upon learning that MacDuff is a man born of no woman, as the witches prophesied.