Putting Ken so low on the list took careful consideration, but the decision is one that I stand by firmly. All things considered, Ken is actually a pretty good father to the only DiLaurentis child who is biologically his. He truly gives it a valiant effort when Alison comes back from the dead and he is reinstated to active parental duty. It's a shame, because he may have actually made for a decent parent if he hadn't locked his trans daughter in a psychiatric hospital before she started kindergarten. Nearly every trauma after season two could have been avoided had Ken not sent Charlotte to Radley and embraced her for who she is, and his transphobia automatically makes him bottom tier.