おかあさん
mother
The same お and さん wrapped round 母. Oh, ka かあ, san さん, and the one being talked about here belongs to somebody else, and she is a beauty: おかあさん.
母 はは is your own mother when you mention her to others. お母さん is what you call her, and the word for anybody else's.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.