For example, some Jewish parents don't care much if their kids lose their faith, and these families probably just buy Christmas trees and hang stockings rather than putting their energies into Hanukkah celebrations. (My wife, who is Jewish, has childhood memories of Christmas Eve at a relative's house, where her family opened presents under the tree. The local Reform rabbi even stopped by at some point in the evening to take part in the festivities.) So, as an additional test of their hypothesis, the researchers look at the group of survey households that reported a strong identification with the Jewish religion, thus excluding the Christmas-tree Jews. In these Jewish-identified homes, households with kids were only one-quarter as likely to skip candle-lighting as those without children, a much bigger effect of having kids than for the survey respondents overall. (Among survey respondents that reported little association to Judaism, the ones with kids were no more likely to celebrate Hanukkah than those without.)