What is juror’s number three position(s) versus his interest(s)?

Juror #3 has a terrible relationship with his own son and feels as if he has done everything for that son to no avail.  He wants the "kid" to be guilty to justify his own intense feelings about his torn relationship.  He finally breaks down and confesses his family difficulties, tears up a picture of his son, cries bitterly and ultimately changes his vote to "Not Guilty."