Reference for Ketubot 200:18

רבינא הוה בידיה חמרא דרבינא זוטי יתמא בר אחתיה הוה לדידיה נמי חמרא הוה קמסיק ליה לסיכרא

Ravina had in his possession some wine belonging to the orphan Little Ravina, his sister's son, and he had also some wine of his own which he was about to take up to Sikara.

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