Reference for Sanhedrin 115:6

אמר רב יהודה לא קשיא הא ר"מ אליבא דר' אליעזר והא ר"מ אליבא דר"ע

If his wife died, he may marry his mother-in-law; others say that he may not!<span class="x" onmousemove="('comment',' Now in this Baraitha a number of relations forbidden to Jews on pain of death e.g., his father's wife and his mother-in-law, are permitted to the proselyte, and hence to heathens in general; whilst a number of relations not forbidden on pain of death, e.g., his sister, his paternal and maternal aunts, are prohibited to him: This, taught in R. Meir's name, contradicts his other ruling that all forbidden degrees of consanguinity punishable by death are forbidden to heathens. ');">⁶</span>

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