My uncle was head copy editor of the NY Times for 20+ years. Neither my mother nor my father was ever heard to say anything that was not grammatically correct. It’s in my DNA and I can’t help it.
Does it mean "his/her parents were never told to say something that is not grammatically correct"?
Doesn't the word "heard" should be replaced by "told"? Is it a well-written, confusion-free paragraph? Or am I misunderstanding?