I came across something interesting tonight. After Nephi and his brothers pick up Ishamel and his family and start heading back to camp, there was a majority rebellion.
[As] we journeyed in the wilderness, behold Laman and Lemuel, and two of the daughters of Ishmael, and the two sons of Ishmael and their families, did rebel against us; yea, against me, Nephi, and Sam, and their father, Ishmael, and his wife, and his three other daughters. (1 Ne. 7:6)
A few verses later, after Nephi broke free of the ropes with which his brothers tied him, we read this.
[They] were angry with me again, and sought to lay hands upon me; but behold, one of the daughters of Ishmael, yea, and also her mother, and one of the sons of Ishmael, did plead with my brethren, insomuch that they did soften their hearts; and they did cease striving to take away my life.(1 Ne. 7:19)
So what would cause one of the sons to change his mind?