Oprah half sister fatherOprah Winfrey stunned audiences on Monday when she announced she had found her long-lost half sister, Patricia, but viewers weren't the only ones surprised by the news.

Winfrey's father, Vernon, told RadarOnline.com he was unaware of Patricia's existence until his daughter mentioned it on-air.

Upon hearing the good news, Vernon said, "I'm pleased for Oprah that she discovered that she has a new half-sister and I would like to meet her too. I intend to call Oprah later this evening actually to try and catch-up with her about the exciting news."

Oprah, who was living with Vernon when her mother, Vernita, gave the baby away, had no idea until recently that her mother had even been pregnant.