Thanks for sharing that story. So sorry about your father. That’s a great idea with your kids. My first kid is due in October and so we’re doing something similar to you. We setup an email account for her.
My wife and I are the only ones that have it. And throughout the day if we see something or we want to send her a message, we’ll just email it. Or forward a pic to her email. We plan to give her the login when she’s in her early teens.
I probably email her once or twice a day. So she should expect thousands of photos and messages when it’s time.
I wrote about it recently here: