I would say, they are related, she is her relative. I gcan't give you a erason why that is just the way I would say it. All sentences are correct.
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MissTerry 1. They are relatives.
2. They are related.
1. She is her relative.
2. She is related to her. Your first pair are more common and less confusing.
I don't understand your question about "be related." All four of your examples use the verb "to be." Could you illustrate what you mean?
Avangi2. Is she related to you? / Is she your relative?What about "Is she a relative of yours?" Or "Is she related to you?" is better anyway?