Help finding half sister Cheryl / Sheryl (surname Kite/Kyte) father Clive Thompson?

I am trying to find my half sister - unsure of exact spelling. I know she would have been born in early 1960 - mid 1960's. My father and her mother were together before I think my parents met. My father is Clive and I also and she also has a brother Anthony. She contacted my Uncle to pass on details but he has not been helpful at all. I know from him is that she met him and exists but won't pass on her details. If anyone could help I would appreciate it sooooo much.