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Lex Luthor, Jr. is the son of Lex Luthor, who lived on the planet Lexor in the pre-Crisis universe. Lex senior had become the planet's champion and took a wife, Ardora, whom he visited sporadically when not on Earth.
Upon his last visit to the planet, Ardora surprised her husband with the reveal of a son they had produced. Over the following weeks, during which Lex senior had committed himself to a reformed life on Lexor, his son was a source of great joy.
Superman eventually caught up with Lex senior who had happened upon a hidden source of advanced technology left behind one of Lexor's extinct civilizations. Lex built an armored suit from the wreckage, strong enough to battle a Superman weakened by the planet's red sun.
During the battle, Lex's offensive interacted with the neutrarod he had built to stabilize the planet's core. The result was a chain reaction that instantly destroyed the planet, including his wife and son.
In other media
Lois & Clark: The New Adventures of Superman
Smallville
Batman v Superman: Dawn of Justice