He chose this film from the video store, described the premise to me and I thought it sounded fun.
If you want

If you want dysfunctional family... you've come to the right movie.
If you want deceit... you've come to the right movie.
It helps that I understand a lot of German...but the subtitles helped.
There's a German line in the movie: "It's never too late to become Jewish." That should get you thinking...
Here are a couple of good movie links. The first is in German, but find the sidebar bit called KINO TRAILER, click on it, and you'll get a peek at the film.
Here's another, more detailed movie link.
If anyone has already seen this film, please let me know your thoughts. It wasn't full-blown funny as in guffaws, but it was filled with lots of chuckles and smiles.
The director, Dani Levy, is from Basel, Switzerland, my mom's hometown. All I can say is that he has an interesting way of viewing the world...
Grab some popcorn, get comfy and hit the PLAY button on the remote.