What's he saying? Since his kids can't write a sentence or spell either, they're geniuses?
I think that the point is that some things that we usually use to judge other people, aren’t necessarily good indicators of how successful they will be. Also, (and that has happened to me) we tend to put people into boxes (engineer, chemist, programmer, philosopher, etc). I am a chemist, for example, and I have had the opportunity to work for some companies and startups doing engineering (mechanical, industrial, and electrical) work. One of the most common things that I faced during my time working as an engineer, if you will, is the phrase, “but you are a chemist”. Meaning that some of them thought that because I was a chemist, I shouldn’t be able to do engineering work.