The main character (who rode a motorbike, I think a Harley) had a niece (around 2 or 3 years old) who didn’t talk yet because her mother talked her in an overly complicated way; like don’t play with the heater because it will break, leak carbon monoxide which will attach to the haemoglobin molecules in your blood and you will die. The movie is from the 80s or 90s I believe.

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