Board Thread:Character Discussion/@comment-10062920-20131103032443/@comment-5655661-20131107160807

Child of the Moon7 wrote: I always thought it was 'Mom' because in season 1 he calls her Emma and later Mom.

But he never said what the codename was... This ^ He also said something like "I'm not sure are you ready for that" (ready for taking mother's role in his life)