Ether 1:16 (LDS Ether 1:41) RLDS 1908 edition of the Book of Mormon uses the singular "family" for the Brother of Jared.
Joseph Smith, Jr., trans., The Book of Mormon, Authorized Edition (Lamoni, IA: Reorganized Church of Jesus Christ of Latter Day Saints, 1908), 715–716
16 And it came to pass that the Lord did hear the brother of Jared, and had compassion upon him, and said unto him, Go to and gather together thy flocks, both male and female, of every kind; and also of the seed of the earth of; every kind, and thy family; and also Jared thy brother and his family; and also thy friends and their families, and the friends of Jared and their families.