1. Hyphenated and compound nouns can seem tricky, but they’re actually pretty simple. If they’re singular, just add an apostrophe and an s to the final word. For Example :
trash can’s lid
mother-in-law’s cooking
2. If the nouns are plural with a regular s at the end, add only an apostrophe to the final word. For Example :
news blogs’ articles
X-rays’ images
3. However, if the word is plural without an s at the end, add both an apostrophe and an s to the final word. For Example :
mothers-in-law’s behaviors