That definitely is a good skill to teach your kids young so they will not be reliant of fast foods and junk foods but will use "real" food and totally know how to prepare it for delicious meals!
Lucky you for having a son who likes to cook and cook for you!
I am very lucky!!! Does your son cook?
He can for we use to have him make a meal of his choice once a week along with the son of our house mates. His wife is a really good cook so he leaves it to her!