Here are the correct versions: 1. Correct: Is he any relation of yours? * Alternative: Is he any relation to you? 2. Correct: Is he a relative of yours? * Incorrect: Is he a relative to you? 3. Correct: Is he not a relative of yours? * Incorrect: Is he not a relative to you? So, the correct sentences are: * Is he any relation of yours? * Is he any relation to you? * Is he a relative of yours? * Is he not a relative of yours? The sentences using "a relative to you" are not correct in standard English.

How about "Is he your relative?"

Is he related to you? Are you related to him? Is he a relative? Are you relatives?

Here are the corrected versions of the sentences: 1. Is he any relation of yours? 2. Is he any relation to you? Both are correct and commonly used. 3. Is he a relative of yours? 4. Is he a relative to you? "Is he a relative of yours?" is the correct and more natural-sounding option. "Is he a relative to you?" is not commonly used. 5. Is he not a relative of yours? 6. Is he not a relative to you? "Is he not a relative of yours?" is correct and sounds natural. "Is he not a relative to you?" is not commonly used. In summary, the correct sentences are: * Is he any relation of yours? * Is he any relation to you? * Is he a relative of yours? * Is he not a relative of yours?

Three of them don't work grammatically-- the one with "relation of yours", and the two with "relative to you." In addition to David's suggestions, I would add: Is he related to you? Are you two related?