You are not being unreasonable - it would have been very stressful waiting there wondering what had happened, had there been an accident or had someone else picked him up unlawfully? That's if you tend to catastrophize like I do ;-)
My question is - Why didn't your daughter advise you that they were going away? If she had done, then you would have immediately said "so you don't need me to do school pick-up on the Monday then?". What if there was an emergency while they were away or you needed to contact them but assumed they should be home but weren't? (there I go again....)
Royal Mail threatens to stop deliveries over dog attacks
What a difference a day makes 😢😢
Craig and Lindsay Foreman end their hunger strike in prison in Iran.

cool down.