His paternal grandparents were Fanny King and James L. McLane. His parents were Augusta James (b. Aug 1, 1867, Catonsville, Baltimore, MD, d. Sep 16, 1938) and Allan McLane, Sr. (b. Dec 8, 1864, Baltimore, MD, d. Sep 15, 1940, Baltimore, MD). Brother of Elinor (b. Jun 13, 1892, MD, d. Mar 18, 1939, Paris, France, married J. Hopkins Smith and William Graham Bowdoin, Jr., b. Oct 4, 1880, Baltimore, MD, d. Aug 28, 1958, Baltimore, MD), Rev. James Latimer McLane, Jr. (b. Mar 17, 1898, Baltimore, MD), and Augusta James McLane (b. Apr 5, 1901, MD, d. Dec 29, 1991, Simsbury, Hartford, CT, married Lucius Franklin Robinson, Jr., b. abt. 1896, CT). Allan married Edith Gibb Pratt (b. Sep 14, 1898, NY, d. Dec 29, 1956). They were parents of Edith G. (b. abt. 1927), Allan J. (b. Oct 9, 1928, NY, d. Oct 3, 1980, NY, married Claire Fuller and Elizabeth Jane Heed, b. Jun 24, 1931, NY, d. 2006, NY), and Robert M. McLane (b. abt. 1930, NY). Allan's father was an attorney who became a circuit judge. Allan was a stock exchange broker.