Lord Krishna is explaining to Arjun that may the other party in the war is your relative or may the other party is noble ; you are in the war against them on the path of truth and truth doesnot sees any relation or emotion it just fights with courage to kill the falsehood. Lord Krishna is explaining that it is his own duty that if he is on the path of truth he must fight against falsehood and mag he die but it is much better than to fight with the emotions and may victory comes but in the side of falsehood.
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I can also answer question 2 but the image is blurry so if u want the answer post it with good image.