Dear Welcome to HCM We understand your concerns I went through your details. I suggest you not to worry much. From the description you gave, it may not be possible to reach to a diagnosis. But from the feel of it, it seems that your father may have dissociative disorder. Dissociative disorders (DD) are conditions that involve disruptions or breakdowns of memory, awareness, identity or perception. Dissociative disorders are thought to primarily be caused by psychological trauma. Prolonged Substance abuse usually lead to this condition. Consult a psychiatrist / psychologist for further proper diagnosis. After diagnosis you can consult me again by posting a direct question to me in this website. Make sure that you include every minute details possible. I shall prescribe some psychotherapy techniques which should help you cure your condition further. Hope this answers your query. Available for further clarifications. Good luck.