Patrick Schwarzenegger's sister happy for him, Miley Cyrus
Katherine, 25, said she loves seeing her 21-year-old brother happy, reported Us magazine.
"You just want your sibling to be happy. If they're with someone who makes them happy and in a happy healthy relationship then I'm happy," she said.
Katherine's family, including her famous parents Arnold Schwarzenegger and Maria Shriver, are reportedly equally as welcoming when it comes to the 22-year-old "Wrecking Ball" singer.