No surprises here, page-4

For those who don't know...
Russell and Keaton are Jews, Kurt is not.

Keaton, by his own admission, considers himself Jewish - from his father's family side - 3 generations in the US, his mother is actually not Jewish, so, technically he is not Jewish. But he had once said that since he could remember he was always growing up as Jew - attending synagogues, following and celebrating at home all Jewish holidays and so on...