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I am so sorry i am about to sleep so i can't write an essay type answer but i have tried...

rehmat in the story is a moneylender(kabuliwala)who is from is the little girl in the story whose father had borrowed money from rehmat...thus everyday rehmat used to come to mini's house and ask for the interest of money from her father.From there only the bond between Kabuliwala and Mini started becoming stronger... Rehmat used to treat mini as his own daughter as he had left his own daughter in kabul, afghanistan...the releshionship between them was like a father and daughter.

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