No kidding ...
Dad wasn’t a “teacher” at the time. (He much later taught some engineering courses at the MS/PhD level).
He also wasn’t technically a veteran, on account of still being active duty.
Regardless, I hit first grade already knowing how to read.
You can teach a four year old ANY language, provided you know it. That foreign language is “domestic” somewhere ... (Latin is hard??? Ineptias! Roman children learned it!)
You can teach a four year old ANY language, provided you know it.