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's house; 's home
「家」 has other readings with different meanings.
山田さんち知ってる?
Do you know where Yamada's house is?
うちの近所にはお寺があるんだ。
There's a temple near our house.
佐藤さんちの庭にはいつもきれいな花が咲いている。
Beautiful flowers are always blooming in the Sato family's garden.