Bro, I am going through the samething. I have good and bad days with it. Some days I feel like I am loosing my mind. I really don't want to take any meds because I know Jesus can heal me or anyone from this.
Hey, you are not alone I know exactly how you feel. I go through the guilt and shame like every hour of my life. I myself have very high respect and love for the women in my family. It's without a doubt I will give my life for her. It's never been like this, but just out of the blue i started gettin all these horrible, nasty and sexual thoughts about my mother. I feel like the worst human being ever created in this whole world when those thoughts come into mind.
I've come to realize that these thoughts were taking control of my life. It has created more distance toward my mother, angry, wanting to get away from her as much as I can. Let me tell you this and take it to heart please... YOU ARE NOT WHAT YOUR OCD THOUGHTS ARE TELLING YOU OR MAKING YOU FEEL! as a matter of fact you are the COMPLETE OPPOSITE. DO NOT GIVE THESE THOUGHTS POWER!! They will upset you, cover your God-given life with guilt and shame. Ask yourself, if you really were attracted to your sister in that type of manner, would you be pulling your hair out every minute of your life??? NO!
Do some soul searching within yourself, you will come to a deep conclusion that you are who you were back then and that is a loving guy for his family. Trust me, I myself went through the worst feelings and images myself, but through the power of Jesus Christ I have broken free. My friend it seems like you are very kind hearted and have strong values for your family. That is the only reason why you struggle with these thoughts and feelings. These OCD thoughts ATTACK your most LOVED and DEAREST people in your life. You WILL break out of those inner chains, by the power of Jesus Christ. Remember, He is God, all power on heaven and earth belong to Him. He understands your pain and frustration. Jesus Christ, Himself KNOWS you more than you know yourself friend. You are NOT what these OCD thoughts are sayin you are! LIVE YOUR GOD-GIVEN LIFE FREELY FOR HIS GLORY AND DO NOT FALL INTO THE HANDS OF THESE OCD THOUGHTS AND THE DEVIL'S FEELINGS OF GUILT AND SHAME. Just remember always, the Lord Jesus Christ is above ANY thought, feeling or whatever demonic things that are goin in your head that DOES NOT belong to you. Do not be afraid, stand firm on the Rock and be free friend.