One should use apostrophe while using reciprocal pronouns while showing possession of nouns or noun phrases for example, it’s each other’s itis each others.
–One should not use apostrophe in case of personal nous of second person I.e, Yours, ours, etc.,
-While using Demonstrative Pronoun always have an obvious antecedent.
-Reflexive and Emphasize pronouns have the same words but serve a different purpose in which the former shows something which does to itself, later shows the emphasis laid by the pronoun on noun.