How many of Abraham Lincolns kids died?

All four (4) of Abraham Lincolns children have died there are NO living descended of Abraham Lincoln ...

1. Edward Baker Lincoln born March 10, 1846 in Springfield, Illinois and died in Springfield, Illinois on February 1, 1850 from pulmonary tuberculosis ...
2. William Wallace Lincoln born December 21, 1850 in Springfield, Illinois William died on February 20, 1862 in Washington, D.C. of typhoid fever ...
3. Thomas Lincoln born April 4, 1853 in Springfield, Illinois and died in Chicago on July 15, 1871 of tuberculosis ...
4. Robert Todd Lincoln was born August 1, 1843 in Springfield, Illinois and he died July 25, 1926 in Manchester, Vermont in his sleep ...