He retired in 1956 with about 1,500 films credited to him: however, his contract with MGM dictated that he receive credit as art director for every MGM film released in the United States, even though other designers may have done the bulk of the work. Even so, his actual hands-on art direction may have been on about 150 films.
In 1930, Gibbons married actress Dolores del Río and co-designed their house in Santa Monica, an intricate Art Deco residence influenced by Rudolf Schindler. They divorced in 1941, the year he married actress Hazel Brooks with whom he remained until his death at the age of 67. ...
Gibbons' nephew is Billy F. Gibbons, guitarist/vocalist for the rock band ZZ Top.
The Wikipedia entry on the hirsute bluesman is a little more exact about the relationship between the two Gibbons:
Gibbons was born to Frederick Royal (Freddie) and Lorraine Gibbons in the Tanglewood suburb of Houston, Texas, United States. His father was an entertainer, orchestra conductor, and concert pianist who worked alongside second cousin, art director Cedric Gibbons, for Samuel Goldwyn at MGM Studios ... . While attending Warner Brothers' art school in Hollywood, California, Gibbons engaged with his first bands including The Saints, Billy G & the Blueflames, and The Coachmen.