Oprah Winfrey scored her best ratings in nearly six years with Monday’s show during which she revealed that she had a half-sister she never knew. The broadcast averaged a 9.6 household rating (according to metered market weighted averages). That’s the highest episode since Winfrey’s post-Oscar party installment on February 28, 2005, according to Reuters.

Winfrey teased the big reveal on her show last Friday promising a “shocking family secret” that she said “literally shook me to the core.”

Winfrey’s younger half-sister Patricia was given up for adoption by Winfrey’s mother in 1963. At the time, Winfrey was living with her father and did not know her mother was pregnant.

In the past, Winfrey has used her daytime show to reveal she was molested as a child and lost a baby at 14.

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