English of Core Text: Rabbi Akiva says: “His father” — this means his father’s wife; “his mother” — his mother literally.
On the daf / in context: In the derivation of the sexual prohibitions for Benei Noach, Rabbi Akiva reads “his father” as the father’s wife (step-mother).
Type of Learning: Custom (scope of “his father” for Noachide law)What Is Learned: For the children of Noach, “leaving his father” includes the prohibition of the father’s wife.