1,942. When Brother C Gives Maamar to Widow A But Then Brother B Dies
Yibum v’Chalitzah 7:5
Let’s say that the first widow was forbidden to one of the surviving brothers as a prohibited relation and he performed yibum with the second widow, who was permitted to him. In such a case, the first woman becomes permitted to the other brothers because the conflict that prohibited her was resolved by the yibum with a permitted brother. However, if the second widow was forbidden to one of the brothers as a prohibited relation, he should perform yibum with the first woman and the other brothers may not perform yibum with either of them. They may only perform chalitzah, as has been discussed. If each of the brothers marries one of the sisters, the couples are made to separate.
Yibum v’Chalitzah 7:6
Let’s say that there were three brothers, two of whom were married to sisters. One of the brothers married to a sister died so the third brother gave maamar to the widow but then the husband of the second sister died, creating a levirate bond between her and the third brother. In such a case, the third brother must give a get to and perform chalitzah with the woman with whom he made maamar, plus he must perform chalitzah with the other sister in order to permit her to re-marry.