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We don't all agree on the morality of polygamy, nor do we all hold the same ethics on whether or not it is ok to marry your wife's sister. However, one Rabbi has published in the Jewish Press that both polygamy and marrying your wife's sister are not prohibited under the Noahide Laws, for those who wanted to know.
Q & A: How Could Jacob Marry Two Sisters?
By Rabbi Yaakov Klass - 4 Tevet 5778 – December 21, 2017