'Brother's' in the Bible

Why do you see the speck that is in your brother's eye, but don't consider the beam that is in your own eye?

You hypocrite! First remove the beam out of your own eye, and then you can see clearly to remove the speck out of your brother's eye.

For John said to Herod, "It is not lawful for you to have your brother's wife."

but Herod the tetrarch, being reproved by him for Herodias, his brother's wife, and for all the evil things which Herod had done,

Why do you see the speck of chaff that is in your brother's eye, but don't consider the beam that is in your own eye?

Or how can you tell your brother, 'Brother, let me remove the speck of chaff that is in your eye,' when you yourself don't see the beam that is in your own eye? You hypocrite! First remove the beam from your own eye, and then you can see clearly to remove the speck of chaff that is in your brother's eye.

Therefore let's not judge one another any more, but judge this rather, that no man put a stumbling block in his brother's way, or an occasion for falling.

unlike Cain, who was of the evil one, and killed his brother. Why did he kill him? Because his works were evil, and his brother's righteous.