Joseph to Maria Lawrence, age 19, [*Allegations of sex] and Sarah Lawrence [*Allegations of sex], age 17; Helen Kimball Whitney, Woman's Exponent, 15 Feb. 1886, 138.) [*maid/housekeeper/girl working for Joseph]
"I am also able to testify that Emma Smith, the Prophet's first wife, gave her consent to the marriage of at least four other girls [Emily and Eliza Partridge, Maria and Sarah Lawrence] to her husband, and that she was well aware that he associated with them as wives within the meaning of all the word implies." –Andrew Jenson, Historical Record 6:230.
I do know that at his [Joseph Smith's] Mansion home was living Maria and Sarah Lawrence and one of Cornelius P. Lott's daughters as his plural wives with the full knowledge of his wife, Emma, of their married relations to him."
[Source: Historical Record 6:223; Lucy Walker Smith Kimball, in the Temple Lot case (full transcript, 461, LDS archives;"More Testimony," Letter dated March 9^th, 1904, Deseret Evening News, April 12, 1904; Exploring Mormonism: Polygamy Timeline, http://www.exploringmormonism.com/polygamy-timeline/]