Answer:
Jerry's Father likes to give the boys nice stuff
Explanation: in the midst of the deppression he gave the boys a piano
Some themes you might consider in the play include:
Greed
Power and ambition
What it means to be masculine and feminine
Trying to persuade
Idealism
What it means to be a (good/bad) leader
The importance of omens
The difference between villains and heroes
It all depends on what about the solar system you talk about and what class you are doing it for.