Identity and ethnic heritage
Both of these characters have ethnic heritage as a central part of their identity and self-perception. When Tasha's brother becomes outlandish and bold about their ethnic heritage, he gets them all deported, which is a sign that when one person in the family does something despicable, the whole family is punished by society. The thematic implications of that portrait are that ethnic identity allows for stereotypes and prejudice, because when one person does something foolish, the family is represented.
The burden of success
When Tasha ends up back in Jamaica, one might say she was made to fail in America, but Daniel is another instance of immigration and family duty, so what do we learn from his story? Daniel's story shows that even the most bright, vigilant over-achiever—even a Yale candidate!—can be made to suffer intense loneliness and frustration. Why? Because he is forced to succeed for his family's honor, which is a heavy burden to bear.
Law and morality
Although law is enforced by such as Jeremy Fitzgerald, we learn from his story that when it comes to other kinds of ethical borders (it is legal to say, have an elicit affair with a coworker), he fails to consider why it might be hypocritical for him to impose the law while partaking in other kinds of injustice. In other words, he is not automatically just, just because he has authority and expertise. Even with all his legal training, he is still deeply human, which is a problem, because that means that our society is only as strong as very limited people can build it.
