For the source text click/tap here: Pesachim 109
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The Sages taught: A man is obligated to gladden his children and the members of his household on a Festival, as it is stated:
יד וְשָׂמַחְתָּ, בְּחַגֶּךָ: אַתָּה וּבִנְךָ וּבִתֶּךָ, וְעַבְדְּךָ וַאֲמָתֶךָ, וְהַלֵּוִי וְהַגֵּר וְהַיָּתוֹם וְהָאַלְמָנָה, אֲשֶׁר בִּשְׁעָרֶיךָ.
14 And thou shalt rejoice in thy feast, thou, and thy son, and thy daughter, and thy manservant, and thy maidservant, and the Levite, and the stranger, and the fatherless, and the widow, that are within thy gates.
We explore the meaning of Simcha and the calculation of the amount of wine that fulfills the obligation.. which is problematic since the Talmud does not use decimal measures...