What was Juror number 3 position versus his interest?

3rd Juror is a small business owner. He proudly says that he started his business from scratch and now employs thirty-four workers. We learn early on that he has a bad relationship with his own son, with whom he is no longer speaking. We are led to believe that this is a contributing factor to his prejudice against the defendant, accused of stabbing his own father. 3rd Juror is the last to be convinced and only changes his mind once he realizes that he is only projecting his feelings about his own son onto the defendant.