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Topic: Marriage Between Step-Brother & Step-Sister

Email@Withheld wrote:

Dear Rabbi,

Is it halachically permissible for a man to marry the daughter of his mother's husband from a previous marriage?

Dear Email@Withheld,

Marriage between a step-brother and a step-sister is permitted, and such is accepted practice. The Chafetz Chaim, Rabbi Yisrael Meir Kagan, married his mother's husband's daughter. I personally know a couple like this who have been happily wed for the past 30 years.

According to Tzava'at Rabbi Yehudah Hechasid step-siblings should not marry. However, this ruling seems not to have been accepted even by those who generally adhere to the other rulings of Tzava'at Rabbi Yehudah Hechasid.


  • Shulchan Aruch Even Haezer 15:11
  • Sefer Shmirat Haguf v'Hanefesh 178

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