What's the relationship betweem Willy and Biff?

Biff is Willy's son. When Biff was a young child, he looked up to his father, so did his brother. He tried to make his father happy by excelling at sports and making a name for himself as a high school athlete. But later, the realtionship between them deteriorated. Willy put too much pressure on him, disaapointments changed the way they saw each other, and finally, the culminating moment when Biff catches his father in a hotel room with another woman. After that...... Biff left and made his own way, although, he never really grew up. None-the-less, he would never look at his father with respect again.