At the age of 34, John Dominic married Martha Burns Gwinn on Monday, November 17, 1941, in Sacred Heart Catholic Church, Mt. Washington, Baltimore, MD, when she was 31 years old.
Martha Burns was born in Baltimore on Monday, January 24, 1910. She was the daughter of Richard Lawrence Gwinn Jr. and Elizabeth Josephine Tack.
Martha Burns reached 77 years of age and died in Chicago, IL, on February 23, 1987. She was buried in Calvary Cemetery, Evanston.
John Dominic Casey and Martha Burns Gwinn had two children:
Theodore Lawrence Casey was born in Chicago, Illinois on February 6, 1948.
Margaret Elizabeth, known as Maggie, was born in Chicago on August 23, 1950.