Siman 366
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 הַמּוֹכֵר קִבְרוֹ וְדֶרֶךְ קִבְרוֹ, מְקוֹם מַעֲמָדוֹ וּמְקוֹם הֶסְפֵּדוֹ, בָּאִים בְּנֵי הַמִּשְׁפָּחָה וְקוֹבְרִין אוֹתוֹ בְּעַל כָּרְחוֹ שֶׁל לוֹקֵחַ, וּמַחֲזִירִין אֶת דָּמָיו.
1 One who sells his [family] grave, the path to his grave, the place of his [funeral] halt and the place of his lamentation, the members of the family may come and bury him against the will of the buyer, and they return his money.
ב אִשָּׁה שֶׁיָּרְשָׁה קֶבֶר מִמִּשְׁפַּחְתָּהּ, נִקְבֶּרֶת בְּתוֹכוֹ הִיא, אֲבָל לֹא יוֹצְאֵי יְרֵכָה; אֶלָּא אִם כֵּן רָאֲתָה אוֹתָם בְּחַיֶיהָ.
2 A woman who inherited a grave from her family maybe buried in it herself, but not her descendants, unless she saw them during her lifetime.
ג אָבִיהָ אוֹמֵר: תִּקָּבֵר אֶצְלִי, וּבַעֲלָהּ אוֹמֵר: תִּקָּבֵר אֶצְלִי, תִּקָּבֵר אֵצֶל בַּעֲלָהּ. וְיֵשׁ גּוֹרְסִין תִּקָּבֵר אֵצֶל אָבִיהָ. וְאִם יֵשׁ לָהּ בָּנִים, וְאוֹמֶרֶת: אֵצֶל בָּנַי, קוֹבְרִין אוֹתָהּ אֵצֶל בָּנֶיהָ.
3 [If] her father says, 'Let her be buried beside me,' and her husband says, 'Let her be buried beside me,' — she is buried beside her husband. And some [versions] read, — she is buried beside her father. If she has children, and says, '[Bury me] beside my children,' — they bury her beside her children.
ד אָבִיהָ אוֹמֵר: לֹא תִּקָּבֵר אֶצְלִי, וּבַעֲלָהּ אוֹמֵר: לֹא תִּקָּבֵר אֶצְלִי, קוֹבְרִים אוֹתָהּ אֵצֶל בַּעֲלָהּ.
4 [If] her father says, 'Let her not be buried beside me,' and her husband [also] says, 'Let her not be buried beside me,' — they bury her beside her husband.