AIBU to report lack of self isolation to school?

[Triceratops3]

A family with 2 DDs in my DDs school returned from a short holiday Venice on Saturday. I have seen photos of them enjoying themselves in Venice on their social media accounts so know that they definitely went.

They have sent their DDs into school today rather than self isolate against the latest advice from the government. The parents' attitude is that we'll all be exposed at some point so there's no point self isolating!

Would I be unreasonable to phone the school and let them know or should I keep quiet? One of the DDs is in the same class as my eldest DDs.

Well my skin is a bit dry atm because of the weather. Could I be... OH DEAR GOD NO....Could I be one of these DRY sneetches? What do I do, 101 or NHS 111? I feel like I should log it somewhere.

Maybe GinDaddy is Richard Gere, and he is still pissed off at Kevin the Gerbil for doing that tell-all story.