The French film, "Le fils de l'autre," was shown in the U.S. with the title "The Other Son" (2012). It was co-written and directed by Lorraine Levy. As the title suggests, the movie plot hinges around two young men, born at the same time in the same hospital, who were switched by mistake. To make the situation even worse, one set of parents is Palestinian, and one is Israeli.
Once everyone comes to the realization that the mistake truly happened, the men are faced with the knowledge that their "parents" aren't their biological parents, their religion is not what it would be if the switch hadn't happened, and their position within the Palestinian-Israeli conflict has been reversed.
The only good news is that both sets of parents, and both of the young men, are people of good will. They all want to work out some sort of arrangement that will make this bizarre situation a little less painful.
The knowledge about the switch is a life-altering event for all six people. How they survive--or don't survive--this event is what makes this such a fascinating film. This movie will work well on DVD. I suggest you seek it out and watch it. It will repay the effort