'Brethren' in the Bible

And Adonijah slew sheep and oxen and fatlings by the stone of Zoheleth, which is beside En-rogel; and he called all his brethren, the king's sons, and all the men of Judah, the king's servants:

Thus saith Jehovah, Ye shall not go up, nor fight against your brethren the children of Israel: return every man to his house; for this thing is of me. So they hearkened unto the word of Jehovah, and returned and went their way, according to the word of Jehovah.