Son dropping Schwarzenegger's last name

Patrick Arnold Schwarzenegger is taking his mother's side.

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The 17-year-old son of Arnold Schwarzenegger and Maria Shriver has followed sister Katherine in tweeting out about their father's secret love child and tearing their family apart.

Patrick's revenge on Dad? He's dropping his famous surname.

MORE: How did Arnie manage to keep it so hush-hush?

Patrick revealed on Twitter that he now wanted to be referred to as Patrick Shriver. He also expressed his feelings over the bombshell revelations that his Sperminator dad fathered a child with a member of his staff, jeopardizing his 25-year marriage to Shriver.

"I love my family till death do us part," Patrick tweeted, then quoted lyrics by rapper Fort Minor: "Some days you feel like s--t...some days you want to quit and just be normal for a bit." Patrick also added the hastag #family.

His comments came after those of Katherine, 21, who tweeted, "This is definitely not easy but I appreciate your love and support as I begin to heal and move forward in life. I will always love my family."

Meanwhile, the scorned Shriver, who issued a statement Tuesday about this "painful and heartbreaking time," sought solace with longtime friend Oprah Winfrey.

Shriver was a surprise attendee at Winfrey's star-studded finale taping in Chicago Tuesday night and thanked the talk-host host for being a close friend for more than a quarter of a century.

"For more than 30 years you have bestowed upon me the most amazing friendship," she told Oprah. "You have shown love, support, wisdom, and most of all, the truth."

The audience erupting in applause at Shriver's remarks.

MORE: The couple joins these other major celebrity splits