Mr.President approves.

Power is usually measured in how much money a person has. A person with money has influence over people without it because money is needed for survival. A rich person can get many people to follow and work for him because he is able to pay them. He or She has the power to do so.

Who possesses the reigns of power in this relationship? Is Daisy intimidated by Tom?
Tom has the power in the relationship. He is rich and can do whatever he feels like. He is also cheating on his wife which means he does not really even need her. Daisy even knows this and stays with him. It shows that Tom has a ridiculous amount of power over her.

In a family the adults have power. They are older, smarter and well they make the money that helps the family. If you choose not do follow orders you can be punished in some way or another. Not much you can do about that since without them you wont be able to survive.