Deni, you've got every right to feel darned proud, as has Matthew.
I'm always amazed when kids turn out well, given that they get people like us as parents, and there are no instruction books or even any hints as to how the change the batteries.
And the more so, given the guff that's written about "parenting" these days. As an antidote, there's a good review of a new book on the subject in this week's New Statesman that will have many a parent muttering in agreement.
Meanwhile, them as has done it right, like Deni, deserve to pour themselves a drink and think "Phew!"
Well done. Now, just start working on his taste in music...