So, you know what it's like when you have spent years teaching the letters and their sounds, and reading to the child, and putting words together, and slowly they start to read, and sound their words out, and you have to set times for them to practice reading each day? And then one day it's really quiet, and you check on them, and they're engrossed in a chapter book that you didn't even suggest and it makes you want to cry?
Well, the construction equivalent just happened. Counting, measuring, math, power tool instruction, years of patience with "helpers", and more have just come together. Daddy's tearing up. : )