Markwood married Elizabeth Susan Potts on 21 Dec 1876 in , , Upshur Co., Wv. Elizabeth (daughter of Jonathan Potts and Charlotte Arbogast) was born on 21 Oct 1853 in , , Highland Co., Va; died on 18 Jul 1935 in , , Upshur Co., Wv. [Group Sheet] [Family Chart]

1. Troy Monroe Gillum was born on 20 Jan 1881 in , , Upshur Co., Wv; and died.
2. Goldie Clarice Gillum was born on 1 Feb 1889 in , , Preston Co., Wv; and died.
3. French Harvey Gillum was born on 22 Jun 1892; and died.
4. Tessora Irene Gillum was born on 15 Apr 1894 in , , Upshur Co., Wv; and died.
5. Edna Greta Gillum was born in 13 Mar in , , Upshur Co., Wv; died on 30 Jul 1938 in , Wellsville, , Oh.
6. (Dau) Gillum was born in in , , Upshur Co., Wv.
7. Glenn Gillum was born in in , , Upshur Co., Wv.
8. Clark Gillum was born in in , , Upshur Co., Wv.