G'mornng Bigwater: it is nice to realize that I am not alone. Congrats on both teaching your son at an early age, which developed his mind and thinking processes. Later in life he will appreciate just what you have done for him, and also in explaining just how it helped you.
My father made me learn to read and write before I attended the first grade, originally I had trouble with "S", until he, in exasperation, finally explained it to me quite clearly, He said "S stands for spanking". However, because of this, I became an avid reader, which in turn shaped my mental development, My fort became spatial visualization. Vedic math was just 'because' it was 'there' and formed a challenge..
Don Jose de La Mancha