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Jonathan and Martha Kent – die when Clark is in his late teen or early 20s (but adult)
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Jonathan and Martha Kent – die when Clark is 25+ and has become Superman
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Silas Stone – dies within a few months of Vic becoming Cyborg
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Silas Stone – dies 6 months to 5 years after Vic becomes Cyborg
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Silas Stone – dies 5+ years after Vic becomes Cyborg
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Jack Drake – dies when Tim is a minor
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Jack Drake – dies only Tim is a young adult
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Jack Drake – dies a natural death when Tim is well into adulthood
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Henry and Nora Allen – death/imprisonment when Barry is a child
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Henry and Nora Allen – die only after Barry has been the Flash for years
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Donald Fite – dies when Anita is a teenager, not reborn
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Donald Fite – dies when Anita a teenager, reborn and speed-aged
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Donald Fite – dies when Anita a teenager, reborn and not speed-aged
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Donald Fite – dies only after Anita is grown