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-'s2
1XX forms the possessive case of singular nouns, and of plural nouns that do not end in -s : 
my sister's husbandMary's generosity yesterday's lesson the children's bedroom
my sister's husbandMary's generosityyesterday's lessonthe children's bedroom2 British EnglishXX the shop or home of someone : I bought it at the baker's (=at the baker's shop). I met him at Mary's (=at Mary's house).
I bought it at the baker's (=at the baker's shop).I met him at Mary's (=at Mary's house).