'Brother' in the Bible

And thou, why dost thou judge thy brother? or again, thou, why dost thou set at nought thy brother? for we shall all stand at the tribunal of the Christ;

no longer, therefore, may we judge one another, but this judge ye rather, not to put a stumbling-stone before the brother, or an offence.

and if through victuals thy brother is grieved, no more dost thou walk according to love; do not with thy victuals destroy that one for whom Christ died.

Right it is not to eat flesh, nor to drink wine, nor to do anything in which thy brother doth stumble, or is made to fall, or is weak.

salute you doth Gaius, my host, and of the whole assembly; salute you doth Erastus, the steward of the city, and Quartus the brother,