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In the sentence “It doesn't merely involve drawing a family tree” (line 2), the auxiliary “doesn't” is conjugated in the 3rd person singular to agree with the subject “It”.
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The sentence “The Internet enables millions of people worldwide to access information about their family history, without great expense” (lines 3 and 4) can be correctly rewritten as The Internet allows millions of people around the world to access information about their family history, without any costs, without changing its meaning.
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There is an occurrence of the past perfect tense in the line 6.
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The relative pronoun “who” (line 5) can be correctly replaced with that.
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The adjective “wealthier” (line 8) means less rich.
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In the second line, “rather than” is used to say that one thing is preferred to another or happens instead of another.
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The text suggests that genealogy consists in drawing family trees at school.
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People study national or world history at school.
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People who research their ancestors only wanted to find famous relatives.
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A few people who participated in the survey discovered they were better off than their ancestors.
