Superman's grandfather, Seg-El, learns Krypton is in danger of being destroyed so that his future grandson will never be born.
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The harsh measures which were inflicted on House El, were similar to what Ancient Rome magistrates imposed on those convicted of treason. Not only would the individual be subjected to capital punishment, their family would be stripped of title, fortune, and property. See more
Kal-El. My future grandson. This is the story of the House of El. Our ending has yet to be written. But this is how it began. Ours is a story of sacrifice and triumph. How the House of El led a revolution against tyranny. The story of your family isn't how we died. But how we lived.
References The Terminator