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Ownership with apostrophe-s, and the plural possessive.
Why you specifically
The rule
Possessive 's shows ownership or a close relationship. Use apostrophe-s with a singular noun or name: Anna's bag, my sister's car. With a plural noun ending in -s, put the apostrophe after the s: the teachers' room, my friends' house. Some irregular plurals, such as children, still take apostrophe-s: the children's toys.
The trap
This is Anna is book.
This is Anna's book.
Use apostrophe-s to show that the book belongs to Anna.
The dogs's owner is here.
The dogs' owner is here.
For a plural noun ending in -s, add the apostrophe after the s to show possession.
My parents's house is big.
My parents' house is big.
For a plural possessive, the apostrophe goes after the plural noun.
That is James pen.
That is James's pen.
For a singular name ending in -s, apostrophe-s is standard in modern English, though some styles use only apostrophe.
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