He was Nellie Aileen Cathcart's (Baba's) uncle.

Clark Alonzo Cox (1861 - 1936) Biography from AskART:

Born in Wellington, Missouri, Clark Cox had a career as a painter of theatre scenes in Louisiana and Texas, and after nearly sixty years in this profession, he turned to landscape painting.

He worked in New Orleans from 1891 to 1904, exhibiting with the Artists' Association of New Orleans *1892 and 1894) and as the Chief Scenic Artist of the Elysium Theatre. As a scenic artist and fresco painter in New Orleans, he worked for the Studio of Frank Cox, who likely was his brother, and their commissions included the decoration of the New Orleans Opera House.

About 1908, he moved to Houston, Texas, and then to Dallas in 1921.

As a fine artist, he was a plein-air painter of watercolor landscapes, working especially in the Davis Mountains and the Big Bend region.

Source: John and Deborah Powers, "Texas Painters, Sculptors, and Graphic Artists" John Mahe II, "Encyclopedia of New Orleans Artists"

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The following is from Ron Ritchie, whose wife is related to the artist and who has an unpublished narrative by Clark Cox written in 1930 which he titled "A Narrative of the Origin and Wanderings of the Cox Family". This is an account of the family and in great detail.

Clark first ran away from home with a traveling Indian show at the age of eleven, lived with the Indians in Oklahoma Territory, traveled in Texas and New Mexico, worked on ranches and often just took off for parts unknown, all before he was 17 years old. He traveled extensively, first with his father James Clayton Cox, then with his brother Frank, and at times they were in business with the younger brother, Eugene. In his later years, Clark built and lived on a houseboat on Galveston Bay, Texas.

Frank started out as a sign painter and Drop Curtain Artist and was an accomplished painter. He devoted much of his artistic abilities to building and rebuilding Opera Houses in Louisiana, Texas, Georgia, Arizona and California. While in New Orleans working with several Opera Houses he took time to supervise the Washington, D.C. parade of events for the celebration at the end of the Spanish-American War.

Although he worked mostly in water colors, after he relocated to California, he painted a large 4 foot by 6 foot oil of Pikes Peak and another of the entrance to the Garden of the Gods.

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An interesting biography of Clark Cox was written by Bob Valen in the Introduction to the book, "A Brush with Passion: The work of Clark Cox" which is available at Carlsbad Caverns Guadalupe Mountains Association, 727 Carlsbad Caverns Highway, Carlsbad, NM 88220 or online here.