2 DCs 6 and 3 - DGPs 2-3 times a month collect them from school/nursery and have them for dinner, not a babysitting arrangement as we don't need it but the DGPs have asked as they enjoy having them.
DGPs have allowed 6yo to go next door into a classmates house to play whilst leaving 4yo with them.
Would you expect for this to be run past you prior to DGPs allowing your 6yo to go to someone elses house without one of them present or would you be ok with it since it's a classmate?
YABU - I'd be ok with it
YANBU - they should have checked with you first