Reciprocal pronouns
We use reciprocal pronouns when two or more people both act as the subject of a verb, and both (or all) individually and equally receive the verb’s action
Each other used to refer to only two people;
one another used to refer to more than two people.
one another used to refer to more than two people.
They can be the object of either the verb itself or a preposition used to complete the verb’s meaning.