I was kind of glad I watched tonights episode even though I had already seen it because I missed some clues in there first when Patrick goes to see reede smith at the crime scene he was at if you look after they are done talking and Patrick turns to walk away the camera pauses for a second on a car in the background that appears to be watching if anyone can check that out.  Now for a big clue I missed usually PJ and Stiles are friendly but when PJ went to see him recall what Stiles said "Patrick my BOY" and Patrick got very serious and mean and said I'm not your boy and Stiles said no I guess your not.  Patrick let Stiles know right then he knows Ref john is his son if you don't believe replay that part you will see that Patrick was mad when he said it.