Ask HN: Family email

So kids are getting old enough to have own email, and I am thinking of getting own domain so they can have one address for a long time. Also, then I can administer their accounts so easier to reset passwords etc, monitor, etc.

So do tweens and teens even use email or is all SN?

And I remember getting mass emails announcing a new personal email address but no one does that anymore — but how do I transition people to my new address smoothly?