1)
Why did He say "Shim'u"?
1.
Malbim: Hashem remembers and does not forget your nuptial love. Why did they and their fathers forget [Hashem]?!
2)
Who are "Beis Yakov" and "Mishpechos Beis Yisrael"?
1.
Malbim: They are (a) the masses, and (b) the Gedolim with a great reputation, respectively.