- His father, Clarence Day Sr, owned a Wall Street brokerage firm and was a banker, a railroad director, and Governor of the New York Stock Exchange.
- His grandfather Benjamin Day and great-uncle Moses Yale Beach were the founders in 1833 of the New York Sun.
- Developed an arthritic condition in the Navy, which effectively made him bedridden for the rest of his life, but did not stem his writing.
- American humorist, best known for "Life with Father" (1935), which was dramatized by Howard Lindsay and Russel Crouse in 1939 and popularly filmed in 1947 (Life with Father (1947)). Sequels were "Life with Mother" (1937) and "Father and I" (1940).
- His uncle Benjamin Henry Day Jr. was the inventor of the Ben Day printing process.
- Day's brother George Parmly Day (1876-1959) was the longtime treasurer of Yale University and co-founder, with Clarence, of the Yale University Press.
- Day's brother Julian Day (1878-1947) was a stockbroker and soldier who served in the British Army during World War I, serving at Gallipoli and Palestine. He rose to the rank of major in the Imperial Camel Corps, was wounded in battle in 1918 and received the Military Cross and Order of the Nile. He lived in London much of his life.
- According to archivist James Moske, who worked in the New York Public Library and cataloged the library's Clarence Day Papers, Day was fascinated by "the changing roles of men and women in American society as Victorian conceptions of marriage, family, and domestic order unraveled in the first decades of the twentieth century.".
- Day sometimes wrote using the pseudonym B.H. Arkwright.
- Day was a vocal proponent of giving women the right to vote, and contributed satirical cartoons for U.S. suffrage publications in the 1910s.
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