Not Exactly Father and Son...

"During his time at Stowe, Cavill met actor Russell Crowe, who was at the school filming scenes for Proof of Life. Cavill was an extra, and used the opportunity to ask Crowe for advice on an acting career. Later, Cavill and Crowe played son and father in the Superman film Man of Steel."
https://en.wikipedia.org/wiki/Henry_Cavill#Early_life

Here is a more in depth reference article.

{"Henry Cavill believes that his entry into professional acting began when he encountered Russell Crowe. The campus of Stowe School was being used as a backdrop for the kidnap thriller Proof of Life, and Henry was among extras. It was a brief meeting that inspired him to continue with his craft.

“I took his hand and said, ‘Hi, Mr. Crowe. My name is Henry, and I’m thinking of becoming an actor. What’s it like?’ And we talked just a bit,”  Henry recalls.  “A few days later I got a signed picture of him in Gladiatorthat said, ‘Dear Henry, the journey of a thousand miles begins with a single step.’ You can imagine how I felt when I got to the end of that first journey of a thousand miles and I’m working with Russell Crowe... And you know, I don’t want it to end.” Indeed, Cavill and Crowe had been filming Zack Snyder’s Man of Steel, with Cavill playing Superman and Crowe, the hero’s doomed alien father, Jor-El."} http://henrycavill.org/en/hc/acting-career

http://jfvrinfo.blogspot.ca/2013/06/man-of-steel-superman-2013.html