Is the Penguin's relationship with his mom incestuous or only implied?

Spoilers about episode 8, and not sure if it's really a theory or if it's confirmed:

Eve is a black woman and still comes off as having a slight resemblance to Francis, almost half-sister/cousin (same dad got with both sisters...), which gives me an idea of how he sees his mom somehow. Casting her made the possible revelation kinda genius. At least she is a surrogate rather than having him actually crossing the line. I'm not even sure if Eve was ordered to speak those lines to him, or if it's just always using the same words shared between a mother and lover, like "mommy/mami" when referring to a girlfriend or sex partner. (Maybe we should use a new word, like "baddie" or something.)