'Brother's' in the Bible

“If you see your brother’s ox or sheep straying, you must not ignore it; make sure you return it to your brother.

If you see your brother’s donkey or ox fallen down on the road, you must not ignore it; you must help him lift it up.

But if the man doesn’t want to marry his sister-in-law, she must go to the elders at the city gate and say, ‘My brother-in-law refuses to preserve his brother’s name in Israel. He isn’t willing to perform the duty of a brother-in-law for me.’

then his sister-in-law will go up to him in the sight of the elders, remove his sandal from his foot, and spit in his face. Then she will declare, ‘This is what is done to a man who will not build up his brother’s house.’