"Der Vater des Jungen, mit dem du gespielt hast"
February 18, 2013
I don't know why you were downvoted, you are completely right. Bernardsia's sentence "The boy's father, with whom you have played" indicates that you played with the father, and is wrong. The German sentence is saying that you played with the boy.
- Who is that over there?
- That is the father of the boy with whom you played.