Article continues below advertisementJoseph Baena Is the Son of Arnold Schwarzenegger and Mildred BaenaSource: MEGAJoseph Baena is Arnold Schwarzenegger's fifth child.Arnold Schwarzenegger's son Joseph Baena is forging his own path.Born on October 2, 1997, the actor and fitness model is the son of The Terminator star and Mildred Patricia Baena. His birth certificate listed Mildred's husband of 10 years, Rogelio Baena, as his father.In 2008, Mildred filed for divorce from Rogelio, citing irreconcilable differences.