Verified answer

Do. "Where do your brother and sister live" can be rewritten as "Where do they live?"

Verbs look the opposite of nouns. Plural nouns end in S. The corresponding verb doesn't. Single nouns don't end in S, but their corresponding verbs do.

That's general help, but this one depends on what is happening in the sentence. Do the brother and sister live together? In that case, the second question is correct. Do they live separately? Then the first question is right.

Lynn is wrong.

You use "do" in that sentence, whether they both live at the same place or in different places.

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DO

because we are asking for two poeple

if it was only the one THEN it will be DOES

Does.