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May and John William Kitson were married in 1882 and their first child Howard Waldo was born in March 1883; a daughter Velma May followed in 1887. Kitson was widowed in February 1888 (New York Times, February 8, 1888; "Death of Mr. Kitson"). Robert Ellin and Kitson were co-executors of Kitson's estate. Her husband's firm, Ellin & Kitson, wss changed to Ellin, Kitson & Company. JW Kitson Estate became a silent partner until the children reached maturity.
She was widowed again following a brief marriage in 1896. Her third husband, William J. Swan, also predeceased her, dying around 1909. She applied to the NY Court to change her name back to Mary Kitson. In 1920 she applied for a United States passport. In November 1914, her son Waldo married Lela Cole, a short story writer of western romances. In 1910 her daughter Velma married Commodore Byron McCandless, a 1905 Naval Academy graduate.
Kitson died on June 17, 1945 at the U.S. Naval Repair Base, in San Diego, California at her daughter's home, the Commanding Officer's Quarters. Her ashes are near her son Waldo's in Hollywood Forever Cemetery, Los Angeles formerly The Hollywood Cemetery, located opposite Paramount Studios, not to be confused with the one on the east coast.
- The Firing Line (1919) Constance Paliser
- Come Out of the Kitchen (1919) Mrs. Daingerfield
- The Burning Question (1919)
- The Woman God Sent (1920)
- Father Tom (1921) Mary
- The Family Closet (1921) Mrs. Dinsmore
- Flesh and Spirit (1922) Mrs. Wallace
- Other Woman's Clothes (1922) Mrs. Roger Montayne
- The New School Teacher (1924) Mrs. Buck
- Death Certificate of Mary Kitson; State of California, County of San Diego, Number 3767/45-044274, dated June 18, 1945.
- May Kitson at the Internet Movie Database
- New York Times Movie Review (May 12, 1919), p. 11
- Guide to the Actors' Equity Association: Records 1913-1991 Allen, Miss Ray and May Kitson v. O'Brian Productions Father Tom (motion picture): Salary claims, 1921-1922 
- Listing of known movies: