Answers

2016-05-07T14:38:23+05:30
I think the narrator and his companion discovered that the two boys Nicola and Jacopo were brothers, when the author saw those two boys the next day polishing shoes. After that the two boys were with them only, like for showing them the city etc. At the time of polishing shoes , they talked to each other.
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but it is not given in text as the narrators companion had talked with them
So may be they came to know, when the author saw those two boys the next day polishing shoes. After that the two boys were with them only, like for showing them the city etc. At the time of polishing shoes , they talked to each other
oh ..........
I m editing my ans. And I m adding this reason.
Ok