That is incorrect. Lee freed slaves left to his wife from her father's estate in December 1862, a few days before the Emancipation Proclamation became effective. Grant had owned a slave for a short period in his life but granted the man freedom when he moved to Illinois in 1859. Grant's wife had use of several female slaves belonging to her father for various periods in their married life, including early in the war. But Missouri records show that the Dent family slaves were freed in January or February of 1863. In any event Missouri ended slavery through constitutional amendment in January 1865. Finally Grant couldn't have owned any slaves when the 14th Amendment was ratified slavery had been ended by ratification of the 13th Amendment in December 1865.