In the recent released Netflix documentary "Arnold," shares how  he struggled to tell his then wife Maria Shriver about his secret son with their housekeeper Mildred Baena

Arnold and Maria, who tied the knot in 1986, encountered difficulties in their relationship and engaged in regular counseling sessions to address issue 

In the Netflix documentary, Arnold shares a moment about one of these counseling session

Arnold recalls feeling as though his heart had stopped upon hearing this question 

He decided to tell the truth and admitted that Joseph was indeed his son 

Arnold explains that Mildred, with whom he had an affair in 1996, continued to work for the family, and they had believed that her husband Rogelio was Joseph's father 

As Joseph grew older, it became increasingly apparent to Arnold that he was the biological father 

Arnold's series "Fubar" is currently available for streaming on Netflix