Two Degrees of Separation (from me) by PotatoD

Question 12

John Guare wrote the play "Six Degrees of Separation" based on a true story. One of the families in the true story was that of a college classmate of mine, whom I met once when she came to buy tickets to a concert, but then it turned out she thought it was a Kinks concert but it was actually a concert by the King's Singers, so she passed. So I guess I'm two degrees of separation from John Guare. His play centers on a young man who claimed to be the son of an Academy award-winning actor. Name the actor.

Sidney Poitier