The Battle Over Citizen Kane . WBGH Boston Video. DVD. 2000.
Brady, Frank. Citizen Welles: A Biography of Orson Welles. New York: Scribner, 1989.
Carringer, Robert L. The Making of Citizen Kane . Berkeley: University of California Press, 1985.
Ebert, Roger. Citizen Kane. Chicago Sun-Times. 15 Mar. 2004 http://www.suntimes.com/ebert/greatmovies/kane.html.
Kael, Pauline. The Citizen Kane Book: Raising Kane. Boston: Atlantic Monthly Press, 1971.
Mulvey, Laura. Citizen Kane. London: BFI Publishing, 1992.
Thomson, David. Rosebud: The Story of Orson Welles. New York: Alfred A. Knopf, 1996.
I couldn't figure it until having watched it again; but it turns out that there is enough to know why his mother abandoned him. Considering the times, the situation and the few actions of Moorehead as his mother, I think I can safely assume that Kane's birth father is abusive, likely alcoholic; and his mother gave him up to insure he is safe from his father and the especially the people that they both became, the life they both sunk into; essentially her acquiescence.
6 out of 7 people found this helpful