How does Brian live an ethical life in terms of family, social interaction and career in My Sister’s Keeper?

The primary purpose of Brian's character is to act as a
foil to his wife Sara.  A foil is a character
who is set up as an opposite or contrast to another more primary character.  The purpose
is to highlight certain traits of the more primary character by drawing a direct
comparison.  In this case, I would not consider Sara to be
unethical by nature, however, Brian's inherent goodness and
integrity tend to paint Sara in an even more negative light.  The main difference
between these two characters is the different relationships they have with their
children (as a result of different parental and gender roles) as well as the different
ways they cope with stress.  Because Brian is such a decent man, the audience more
naturally sides with him over his wife.

As far as Brian's
ethics are concerned, he is a devoted father, husband and firefighter.  He puts in to
all three jobs equal attention and positivity.  He is not rich, but (main story line
aside) seems happy.  He is probably hardest on his son, as all fathers tend to be, but
he admittedly loves his children equally and shows that he has a unique relationship
with each one.  He also admits that he isn't perfect, but tries to do the best with what
he has.  It is clear that he is well liked at the fire station, and respected by his
daughters.  Even his son, who is on the verge of dilinquency, eventually comes around,
showing that his father, as a role model, has done an adequate job.  Brian wants what is
best for his entire family, and shows this by pushing Sara to allow the girls to decide
for themselves what they want to do.  Because of his more paternal sense of patience
(mothers tend to worry more and show more emotion) the comparison between Brian and his
wife paints Sara as the "bad guy" in the family.  Brian's sense of right and wrong is
very black and white, which is likely why it seems easier for him to come to conclusions
on major decisions and seem less emotionally driven.

In the
end, however, it is clear that Brian loves his wife and his children.  It is also clear
that he is equally (if not more) stressed about the medical/legal situation created by
his daughter(s).  Despite this, he makes an effort to keep things as normal and routine
as possible.