I wonder what is the peshat for the son to listen to the torat imecha on addition to mussar avicha. First, it means ima has that torah…it is also oral torah as it is shma, not koreh…
probably got it from her mother or learned on her own as the father would be asur to teach, many darshin like that.
Also, if the son needs to listen to that, Kal vahomer the daughter? So we can have oral tradition by the women..
Maybe they didn’t write it down yet?