Dexter's Laboratory
Dexter, a boy-genius with a secret laboratory, constantly battles his sister Dee Dee, who always gains access despite his best efforts to keep her out, as well as his arch-rival and neighbor, Mandark.

Season 2 · Episode 63 ·
Sister Mom
After Dexter did something really bad at school, he gets her mother called, so to not ruin his reputation, he turns Dee Dee into Mom.
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Episode 63 of season 2 of Dexter's Laboratory: “Sister Mom”. Aired 1998-01-21. Watch it online free on ZapFlix.