'Brother's' in the Bible

And Jehovah saith unto Cain, 'Where is Abel thy brother?' and he saith, 'I have not known; my brother's keeper -- I?'

And He saith, 'What hast thou done? the voice of thy brother's blood is crying unto Me from the ground;

And to Eber have two sons been born; the name of the one is Peleg (for in his days hath the earth been divided,) and his brother's name is Joktan.

And Abram taketh Sarai his wife, and Lot his brother's son, and all their substance that they have gained, and the persons that they have obtained in Charan; and they go out to go towards the land of Canaan; and they come in to the land of Canaan.

and they take Lot, Abram's brother's son (seeing he is dwelling in Sodom), and his substance, and go away.

and thou hast dwelt with him some days, till thy brother's fury turn back,

till thy brother's anger turn back from thee, and he hath forgotten that which thou hast done to him, and I have sent and taken thee from thence; why am I bereaved even of you both the same day?'

and Onan knoweth that the seed is not reckoned his; and it hath come to pass, if he hath gone in unto his brother's wife, that he hath destroyed it to the earth, so as not to give seed to his brother;