Is each other singular or plural?
Each other is singular, so the correct possessive is each other’s. Edit: I found some controversy on this on the web because each other implies that there are multiple people involved, hence people think it is plural and should be written each others’. This, however, is wrong as each is always singular.
What is the difference between each and every?
Each vs. every is a common grammar issue, even for proficient writers, because let’s face it—they’re very similar words. Although both words refer to something that is singular, each refers to an individual object or person, while the term every refers to a group of objects or people lumped together as one.