Eliza J. Webb recounts the Joseph/Fanny Alger sealing.
Eliza J. Webb [Eliza Jane Churchill Webb], Letter to Mary Bond, 24 Apr 1876 in Biographical Collection, folder P21 f11 item 9 item 7, 8 Myron H. Bond. P21, Community of Christ Archives
Fanny Alger's mother says Fanny was sealed to Joseph by Oliver Cowdery in Kirtland in 1835-or 6, and Brigham says Oliver had a girl sealed to him at the same time.
I only know that Emma Smith turned Fanny out of her house because of Joseph's intimacy with her. Joseph never had any living children by his polygamous women, although It is always supposed that Eliza R Snow had a child, as she went into retirement for a year before Joseph's death. There are women living in Utah now who were sealed to Joseph while living with their husbands, and they say it was the greatest trial of their lives to live with two men at the same time. Fanny Alger had lived in Joseph's family several years, and when she left there she came and lived with me a few weeks. I suppose your mother will remember what a talk the whole affair made.
Mormon Polygamy Documents, JS0525. Transcript by Brian Hales and Don Bradley.