Sam Houston Jr. (May 25, 1843–1894) was the oldest of eight children born to Sam Houston and Margaret Lea Houston, and was the only Houston child born in the Republic of Texas, before its December 29, 1845 annexation to the United States. He was home-schooled by his mother, and later attended both Bastrop Military Institute and Baylor University. After Texas seceded from the Union in 1861, he enlisted in the Confederate States Army 2nd Texas Infantry Regiment, Company C Bayland Guards. Wounded at the April 1862 Battle of Shiloh, he served time as a prisoner of war at Camp Douglas in Illinois. Following his release, he received a medical discharge from the Confederate States Army. He attended the Philadelphia University of Medicine and Surgery. Upon graduation, he returned to a private life, and it is unknown if he ever practiced medicine. At some point, he became a writer. Houston married Lucy Anderson in 1875. Their daughter Margaret Bell Houston (1877–1966) was also a writer, as well as a suffragist who became the first president of the Dallas Equal Suffrage Association. Upon his death, Sam Jr. was buried on private property near his mother.