Jason DiLaurentis is Alison's brother. He doesn't remember what he was doing the night his sister was killed.

Pretty Little Liars Quotes

We made a pact Emily. A is finally dead and we were all ready to get back to our lives and now we're on Planet Alison.

Spencer

Spencer: Senior year is supposed to be best year of life, did you know that it?
Emily: Yeah, if you survive it.