11 years old is a lovely age. (Quite grown up but still a child at heart).
12 years old is even nicer. (Bubbling with energy and self-confidence and usually incredibly helpful and thoughtful)
13? 14? 15? Well, I enjoyed teaching those ages (particularly if I'd taught the same people when they were younger, so that I could follow their development) but, as I'm sure you will remember from your own teaching experience, not everyone likes boys in their early teens!
I'm sure that, with such a lovely Mum, T will grow up to be a fine young man.
After all, he won't have much choice, will he?
;-)
Chris