Katherine Eunice Schwarzenegger Pratt (born December 13, ) is an American author, and the eldest child of actor and former Governor of California Arnold Schwarzenegger and broadcast journalist Maria Shriver. The Gift of Forgiveness: Inspiring Stories from Those Who Have Overcome the Unforgivable is. Katherine's dad is action movie star Arnold Schwarzenegger. 2 at the luxurious San Ysidro Ranch in Montecito, California - with Terminator star Arnie walking his daughter down the aisle. When did Katherine and Chris Pratt start dating? Aurelia Jadrny () (Age 75 Or 76). Brother, Meinhard Schwarzenegger. Family Member, Katherine Eunice Shriver Schwarzenegger (Daughter).