How does the Macduff family contrast with the Macbeth family in Macbeth?

Obviously the two families are very different and are
juxtaposed to show dramatic contrast. In particular, consider the following differences
and how they enhance the contrast between the Macduffs and the
Macbeths.

Firstly, Macbeth shows himself to be willing to
commit murder to secure his own rise to power and then to protect his position. Macduff,
as we see in Act IV scene 3, is fiercely loyal to Scotland above all, and will do
anything to protect it from the exploitation of characters like Macbeth. Note how he
addresses Scotland whilst talking to Malcolm:

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Bleed, bleed, poor
country!

Great tyrany, lay thou thy basis
sure,

For goodness dare not check thee! wear thou thy
wrongs;

Thy title is
affeer'd!

Macduff is clearly
the polar opposite of Macbeth, who will do anything to seize and maintain his
power.

Secondly, Lady Macduff and Lady Macbeth are polar
opposites as well. Lady Macduff only appears in one scene, Act IV scene 2, but her role
as a mother figure is reinforced by her playful conversation with her eldest son. She,
like her husband, is presented as a likeable, loving figure, who is passionately
committed to family. Lady Macbeth, by contrast, has no family and is all to willing to
sacrifice her "sex" when she implores the spirits to make her less human and more evil
to ensure her husband's rise to power.

Thus, all in all, we
can see how these two families are deliberately contrasted and are completely different.
Of course, the slaughter of the Macduff family is yet another indicator of Macbeth's
descent into evil, and the conflict between Macduff and Macbeth seems to represent the
battle between good and evil.