Hi, I was checking the cast for Godfather III on IMDB and came across a character named "Regina Corleone" played by Marilee Albert. Would Regina be Fredo's illegitimate daughter? The entry also says "uncredited". Does Regina appear in the Corleone family photo? I have read that there is a non-canon thing about Rita Duvall having Fredo's illegitimate son who she then puts up for adoption.
Marilee was FFC's philosophy tutor and wrote a novel about that titled "The Tutor".