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each other one another
You use each other or one another to show that each member of a group does something to or for the other members. For example, if Simon likes Louise and Louise likes Simon, you say that Simon and Louise like each other or like one another. Each other and one another are sometimes called reciprocal pronouns.
Each other and one another are usually the direct or indirect object of a verb.
You can also use them as the object of a preposition.
You can form possessives by adding 's to each other and one another.
There is very little difference in meaning between each other and one another. One another is fairly formal, and many people do not use it at all. Some people prefer to use each other when they are talking about two people or things, and one another when they are talking about more than two. However, most people do not make this distinction.