Someone I know has just come back from Spain (been living there for the last year, got home on Monday) and gone straight back into a social life for herself and her 3 DC "because they've all missed everyone so much" (return was meant to be in April but delayed due to Covid).
She's just invited me to a SURPRISE BABY SHOWER she's decided to organise for her pregnant sister this weekend which she will be attending along with all 3 of her DC 
Obviously I've said I won't be going and asked why she isn't quarantining and she just said that where she was in Spain there were not many cases so she doesn't think it's necessary.
Would you warn the sister? I don't think she knows it is happening and she might rather avoid someone who's meant to be in quarantine!