1)
Who is the father?
1.
Rashi: It is Hashem.
2.
R. Yonah: It is simply their father.
3.
Malbim: It is the author's father; I will tell you the Musar that I heard from him (3).
2)
Why does it say "v'Hakshivu Lada'as Binah"?
1.
R. Yonah: Via Musar, you will merit Binah.
2.
Malbim: In addition to the Musar that I received from my father, hearken also to what I contemplated about it with my Binah. Via this, you will know the matters clearly - "Lada'as Binah."