"Yes, it is" is the correct answer to that question.
You could also say "Yes, that's him".
2019年10月5日
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Thanks
2019年10月5日
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Better to say “ Yes, it is “ because the question asks is THIS your Dad ?” So “it” is used in the answer. If the question had been “ is HE your Dad?” You’d say “ yes, he is my dad.