Found his marriage on ancestry.com. He married Gladys when he was 22. Gladys was 19. They married on 3/28/1933 by the Reverend J. N. Gold. They were married in Stella, Newton County, MO. Source is Missouri Marriage Records, 1805-2002. Pg #79.
Here is a link to his marker, on Findagrave. When you look at it you will see his wife is also linked and you can view their marker as they are buried together. :)
When you click on her name, her parents are listed as their markers are also on Findagrave. Her parents also have links.
Found a Mullins Family Tree an Ancestry.com, here is the info:
Father: Elijah Brownlow Mullins b. 11/12/1860 d. 4/3/1935
Born in Stone, MO Died in Barry, MO
Mother: Nancy Jane Shockley b. 9/3/1865 d. 6/6/1938
Born in Lawrence, MO Died in Exeter, Barry County, MO
Laura Martha Mullins 1886-1951
Martha Rosanna Mullins 1886-1951 TWINS!! NICE! :)
Ted Sherman Mullins 1894-1984
Steve Lafayette Mullins 1897-1923
Lottie Amelia Mullins 1898-1972
Sarah Alma Mullins 1901-1975
Elijah and Nancy married 5/21/1885 in Crane, Stone County, MO
Here is a link to the profile on ancestry. I hope it works as I am logged in.
There is a lot more info, parents, etc....