(Andrew, named after a character from The Coffin of Andy and Leyley by the same name. I do NOT support Nemlei or the contents of the game.)
Andrew is ¨more sane¨ than his sister, say the pupsitters and his biological parents. Though they praise them for this, he actually despises his parents. His parents never actually wanted to parent him and his sister, and so he was stuck taking care of his sister ever since. She´d annoy him all of the time and he got sick of it. Apparently his parents did too, and dropped him and Ashley off at the Enclave. He doesn´t miss them.
Sometimes, he does feel bad for Ashley, for whatever reason. Most of the time he is very calm and reserved.