I have Capgras Syndrome, this is a disorder in which a person holds a delusion that a friend or family member has been replaced by an identical-looking impostor.
My dad took me to the psychiatrist that diagnosed me, she promises me my parents are actually my parents and not impostors. There is no real treatment; some drugs you can take, but in my case, they don’t work.
You see, the whole process of seeing a psychiatrist would have been a hell of a lot more believable if I didn’t find my parent’s bodies in the basement. My dad doesn’t know I’ve found them, but I have, I just need to contemplate my next move. No-one will believe me, will they, do you?