Sefer HaChinukh Mitzvah 194
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שֶׁלֹּא לְגַלּוֹת עֶרְוַת בַּת הַבַּת – שֶׁלֹּא לְגַלּוֹת עֶרְוַת בַּת הַבַּת. שֶׁנֶּאֱמַר (ויקרא יח י) אוֹ בַת בִּתְּךָ לֹא תְגַלֶּה עֶרְוָתָן כִּי עֶרְוָתְךָ הֵנָּה. כָּל דִּינֶיהָ כְּדִין בַּת הַבֵּן, וּשְׁנִיּוֹת לָהּ גַּם כֵּן בַּת בַּת בִּתּוֹ, וְכֵן בַּת בֶּן בִּתּוֹ. וְיֵשׁ שֶׁאוֹמְרִין, שֶׁאֵין לָהֶם הֶפְסֵק לְעוֹלָם.
To not reveal the nakedness of the daughter of the daughter: To not reveal the nakedness of the daughter of the daughter, as it is stated (Leviticus 18:10) “or the daughter of your daughter, you shall not reveal, as it is your nakedness.” All of its laws are like the law of the daughter of the son; and the ones secondary to her are also the daughter of the daughter of daughter and, likewise the daughter of the son of the daughter. And some say that there is no end to [the generations of] these prohibitions ever.