If you want to make possessive a plural irregular noun that does not end in S, like children, add both an apostrophe and also an S: children’s clothes. It’s easy. Or it should be.

A possessive can be a noun, pronoun or adjective. Nouns are usually made possessive by adding an apostrophe and an ‘s’. For example, meet Rachel - a television news reporter.

On October 22nd, at 2:50 P.M., @APStylebook tweeted a series of guidelines about how to punctuate possessives of nouns that end in “S”: “For possessives of plural nouns ending in s, add only ...