'Brethren' in the Bible

And there come his mother and his brethren; and, standing without, they sent unto him, calling him.

And a multitude was sitting about him; and they say unto him, Behold, thy mother and thy brethren without seek for thee.

And he answereth them, and saith, Who is my mother and my brethren?

And looking round on them that sat round about him, he saith, Behold, my mother and my brethren!

Jesus said, Verily I say unto you, There is no man that hath left house, or brethren, or sisters, or mother, or father, or children, or lands, for my sake, and for the gospel's sake,

but he shall receive a hundredfold now in this time, houses, and brethren, and sisters, and mothers, and children, and lands, with persecutions; and in the world to come eternal life.

There were seven brethren: and the first took a wife, and dying left no seed;