2 Nephi 5

 Nephi tells us - 

"...I, Nephi, did take my family, and also Zoram and his family, and Sam, mine elder brother and his family, and Jacob and Joseph, my younger brethren, and also my sisters, and all those who would go with me. And all those who would go with me were those who believed in the warnings and the revelations of God; wherefore, they did hearken unto my words."  (2 Nephi 5:6)

Here we learn that Nephi had sisters.  He doesn't tell us if these are his sisters married to the sons of Ishmael or others and even if they are married.