'Brother's' in the Bible

Then the Lord said to Cain, “Where is Abel your brother?” And he said, “I do not know. Am I my brother’s keeper?”

He said, “What have you done? The voice of your brother’s blood is crying to Me from the ground.

Now you are cursed from the ground, which has opened its mouth to receive your brother’s blood from your hand.

His brother’s name was Jubal; he was the father of all those who play the lyre and pipe.

Two sons were born to Eber; the name of the one was Peleg, for in his days the earth was divided; and his brother’s name was Joktan.

Stay with him a few days, until your brother’s fury subsides,

until your brother’s anger against you subsides and he forgets what you did to him. Then I will send and get you from there. Why should I be bereaved of you both in one day?”

Then Judah said to Onan, “Go in to your brother’s wife, and perform your duty as a brother-in-law to her, and raise up offspring for your brother.”

Onan knew that the offspring would not be his; so when he went in to his brother’s wife, he wasted his seed on the ground in order not to give offspring to his brother.