From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.

Given Relationship: 'become', Sentence: 'The organization which evolved was the guts of the unit which became the OSS and later the CIA .'
became

Given Relationship: 'endorse', Sentence: 'Colin Powell endorsed Obama because he 's black .'
endorsed

Given Relationship: 'be brother of', Sentence: 'Stephen Green , a real estate financier and brother of former New York City official and mayoral candidate Mark Green , has agreed to take over the struggling network .'

brother