An old misunderstanding exists among the two families so they are not friendly any more ........

English ( Master) Sentence Improvement

An old misunderstanding exists among the two families, so they are not friendly any more.

has exist within the two families

No improvement

exists between the two families

will exist among the two families

Between (preposition) is used when two persons/things are involved. Among is used when more than two persons/things are discussed.

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