おとうさん
father
The one with the axe, with お on the front and さん on the end because you are talking to him rather than about him. Oh, tou とう, san さん, and you would not say 父 to his face: おとうさん.
父 ちち is your own father when you mention him to somebody else. お父さん is what you call him, 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.