What is the meaning of "Someone's"? Is it okay to finish with "apostrophe + s"?
"Someone's" here is a possessive, meaning belonging to. In this case, specifically belonging to "Someone". "Grandpa" is a common short form for "grandfather". This is grammatically correct. Just as you can say "it's mine" you can say it is "someone's", using either a name or, like here, a title. Ex: A: Whose bag is this. B: I think it's Jamie's. (belongs to Jamie) Ex: A: I love your car. B: Thank you, but actually it's my wife's. (belongs to my wife)
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