Siman 162
Presented here for study, not as a practical ruling. The Shulchan Aruch rules by Sephardi custom, the Rema's glosses by Ashkenazi custom, and the Kitzur follows Ashkenazi custom. For a practical question, ask your rabbi.
א הַכּוֹנֵס אֶת יְבִמְתּוֹ, נֶאֶסְרוּ צָרוֹתֶיהָ עָלָיו וְעַל שְׁאָר הָאַחִים, בַּעֲשֵׂה:
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ב הַחוֹלֵץ לִיבִמְתּוֹ, נֶאֶסְרָה הַחֲלוּצָה וְצָרוֹתֶיהָ עָלָיו וְעַל שְׁאָר הָאַחִים, בַּעֲשֵׂה:
2 When a man performs chalitza (ceremony to undo the levirate bond) on a woman bound to him for levirate marriage, that woman and her co-wives become forbidden to him and to all his brothers by positive commandment.
ג הַחוֹלֵץ לִיבִמְתּוֹ, אָסוּר מִדְּרַבָּנָן בִּקְרוֹבוֹתֶיהָ, אֲפִלּוּ בִּשְׁנִיּוֹת. וְכֵן הִיא אֲסוּרָה בִּקְרוֹבָיו. אֲבָל הָאַחִים מֻתָּרִים בְּכָל קְרוֹבוֹתֶיהָ. וַאֲפִלּוּ לֹא חָלַץ לָהּ אֶלָּא מִסָּפֵק, אֲפִלּוּ הָכִי אָסוּר בְּכָל קְרוֹבוֹתֶיהָ (מָרְדְּכַי רֵישׁ הַחוֹלֵץ):
3 A man granting chalitza (separation ceremony for a woman bound for levirate marriage) to his [late] brother's wife, is Rabbinically forbidden to marry her relatives, even second degree relatives. Similarly, she is forbidden to his relatives. But his brothers are permitted to her relatives. Rema: Even if he performed chalitza out of doubt, he is still forbidden to all her relatives (Mordechai, beginning of chapter haCholetz).
ד מֻתָּר אָדָם לִשָּׂא אֲחוֹת צָרַת חֲלוּצָתוֹ וּשְׁאָר קְרוֹבוֹתֶיהָ:
4 A man is permitted to marry the sister or other relatives of the co-wife (tzara) to his [late] brother's wife to whom he had given chalitza.
ה אָסוּר לִשָּׂא צָרַת קְרוֹבַת חֲלוּצָתוֹ:
5 If is forbidden to marry the co-wife of any of the relatives to his [late] brother's wife to whom he had given chalitza.