I need help understanding what is wrong with my mental father, please!?

Have you spoken to your Mother about his bizarre behavior? It honestly sounds like your Father has had some sort of psychological break. I would recommend she get him evaluated. The good thing is that you no longer have to live with him, but she does. If she can live with it, then regrettably, you have to as well. I'm sorry about your relationship with your Father. I hope it gets better.