Have you ever seen this grammar mistake on Facebook?A friend will write, "Happy holidays from the Miller's!"But the word "Millers" has an apostrophe before the "s." That is incorrect. We use an apostrophe to show possession. As in, "The Miller's cat got out again." "Miller" apostrophe "s" cat. Miller's cat. When the word in question is plural, add the "s" and that's it. Your grammar-loving friends on Facebook will appreciate you.