Brethren who had

1. Mosiah 21: 34
     34 Therefore they did not at that time form themselves into a church, waiting upon the Spirit of the Lord. Now they were desirous to become even as Alma and his brethren, who had fled into the wilderness.
2. Mosiah 25: 9, 12
     9 And again, when they thought of their brethren who had been slain by the Lamanites they were filled with sorrow, and even shed many tears of sorrow.
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     12 And it came to pass that those who were the children of Amulon and his brethren, who had taken to wife the daughters of the Lamanites, were displeased with the conduct of their fathers, and they would no longer be called by the names of their fathers, therefore they took upon themselves the name of Nephi, that they might be called the children of Nephi and be numbered among those who were called Nephites.
3. Alma 16: 5, 8
     5 Therefore, he that had been appointed chief captain over the armies of the Nephites, (and his name was Zoram, and he had two sons, Lehi and Aha)—now Zoram and his two sons, knowing that Alma was high priest over the church, and having heard that he had the spirit of prophecy, therefore they went unto him and desired of him to know whither the Lord would that they should go into the wilderness in search of their brethren, who had been taken captive by the Lamanites.
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     8 And they came upon the armies of the Lamanites, and the Lamanites were scattered and driven into the wilderness; and they took their brethren who had been taken captive by the Lamanites, and there was not one soul of them had been lost that were taken captive. And they were brought by their brethren to possess their own lands.
4. Alma 19: 14
     14 Now Ammon seeing the Spirit of the Lord poured out according to his prayers upon the Lamanites, his brethren, who had been the cause of so much mourning among the Nephites, or among all the people of God because of their iniquities and their traditions, he fell upon his knees, and began to pour out his soul in prayer and thanksgiving to God for what he had done for his brethren; and he was also overpowered with joy; and thus they all three had sunk to the earth.
5. Alma 24: 24
     24 Now when the Lamanites saw this they did forbear from slaying them; and there were many whose hearts had swollen in them for those of their brethren who had fallen under the sword, for they repented of the things which they had done.
6. Morm. 3: 9
     9 And now, because of this great thing which my people, the Nephites, had done, they began to boast in their own strength, and began to swear before the heavens that they would avenge themselves of the blood of their brethren who had been slain by their enemies.