There is a genetic predisposition to schizophrenia.
Compulsory lying is a very difficult thing to over come. Remember, when the lying becomes compulsory, it can be classified as a mental illness. I would suggest consulting a therapist or use coping mechanisms (such as taking a deep breath after you lie to remind yourself to tell the truth). You sound like you're going through some tough stuff. Stay strong and don't stop fighting.
False. Hereditary means something really different.