Am I expecting an unreasonable amount of communication

[ALE1]

First off, I know the decision to let them go will be controversial but it's a bit late for that.

I have 3 kids, twin boys who are 17 (18 next week) and a girl who turned 16 earlier this month. DD loves tennis, as does my nephew and both my boys enjoy it but not loads.
My nephew is 22, and suggested last year taking her to Wimbledon, so she missed a couple of days of school last July and went to Wimbledon. Had an amazing time. This year her GCSEs were already over and they went again. My nephew has always said they have a great time.
DH and I had no holiday time this summer as we have a wedding in New Zealand in November taking up 3 weeks (to make it worth it). This meant no real holiday for the kids. This is when my nephew told everyone he was going to New York for the US Open. DD was jealous and my nephew offered to take her. We pondered and agreed. Obviously both boys then also wanted to go.
So on Friday all 3 DC (16,17,17), my 2 nephews and niece (22,20,18) flew out to New York. They have grounds tickets for the US Open for a few days, tickets for the grandstand one day and a bunch of sightseeing plans. My parents basically paid for it all.

The issue is, we are not getting much communication. When they have gone to London we have always asked for morning call and evening message. Since Friday we have had no calls, a message in their morning and an evening message twice.
I'm constantly worried about them, obviously if they were all 18 it would be different but they aren't. They fly back on Monday and I don't think I can handle this until then.
I'm tempted to say that at-least one of them have to call me in the morning and I expect a message when they get back to then hotel (yes I'll be asleep but it will settle me if I wake or in the morning).
I'm really starting to wish I hadn't let them go.

AIBU to demand more communication? Should I just let them have fun?

@ErosandAgape it was 😁 we weren't worried - we trust them and the people they were with to let us know if there was a crisis. I think we are quite chilled 😂🤣

You are getting a daily morning message. You need to chill out, they are alive and I'm sure if anything was wrong they would be straight in touch. Are you leaving them on their own when you go to NZ?

Wow, OP. Yes, YABU. It's pretty astounding they text you every morning. I would try not to worry. Be happy you've raised confident children who (hopefully) enjoy travel. They could all be on gap years soon...

They have contacted you though. At the beginning and end of day which suggests when they are back at hotel or airbnb and have wifi. They may not have bought a data package for just a few days.

YABU OP! FWIW I think well done to you for letting DD go but that brings consequences for you, but it's still a great thing you did. Now all you have to do is keep your worries to yourself and let her enjoy it.

I do understand, DS flew to a big city a few weeks ago at 15 and had to navigate the airport and underground alone to meet up with family abroad. I nearly had a heart attack every time he was in transit waiting for updates. Its hard.

Three adults, two so close they might ad well be adults and a 16 year old. And they are in contact by text at least once every day.
Time to snip the cords and let them go.
This is a you problem, not them

Morning and evening messages are fine! As they say, no new is good news. I bet they’re having a while of a time.

So you've had morning messages every day and evening messages two out of four days? I think you need to chill out. You're hearing from them every day, sometimes twice a day. If you really need an evening message daily then ask them to quickly check in but I'm not sure why you need it if you've already had a morning one

What an amazing trip - I hope they have the loveliest of times. There will be very little alcohol involved as only one is over 21. Carding is so strict in the US. One contact am and pm, no matter what method should be fine.

YABU I thought you were going to say you hadn't heard from them at all!