This nut," he continued, with playful solemnity, "while so many of his brethren have fallen and been trodden under foot, is still in possession of all the happiness that a hazel nut can be supposed capable of."
There are no more uses of "brethren" in the book.
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The problem with the Fannie Mae and its GSE brethren is...
The world is my country, all mankind are my brethren, and to do good is my religion.