Quoting%20commentary for Ketubot 205:27

אשת אב נמי דאורייתא היא דתניא כבד את אביך ואת אמך את אביך זו אשת אביך ואת אמך זו בעל אמך וי"ו יתירה לרבות את אחיך הגדול

[The commandment to honor] a stepmother is also from the Torah, for it was taught: “Honor your father and your mother,” “your father” includes your stepmother, “and your mother” includes your stepfather. And the superfluous vav includes your older brother?

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