On Feb. 20, 1841, he married Caroline Eliza Nickerson Hubbard, widow of Marshall Hubbard. She was the mother of Persia Grover, born Dec. 27, 1841, and Marshall Grover, born Sept. 27, 1846. This wife Caroline wrote in her journal "that the principle of plural marriage was taught by the Prophet Joseph Smith, that her husband, Thomas Grover, believed and accepted that law, and that on Dec. 17, 1844, he married Hannah Tupper, daughter of Silas Tupper, and Hannah Ladd, as a plural wife. The first child of that union, Thomas, Jr., was born Nov. 17, 1845 in Nauvoo, Ill.