DSis & BIL have 2DC, she works part time and he does shifts so normally they manage between themselves for holiday care etc.
About 4 years ago a kid from 'around the corner' started knocking to play. Age wise he's in between both DNephews so they all played happily together.
Anyway all was going fine, the little kid was nice and polite etc only knocked Tues & Thur, you see where this is going. . .
All came out when he fell bumped his knee and wanted his Mum.
She was at work, they'd been providing free childcare for nearly 2 summers, and 2half terms without knowing. . .
Sis/BIL were both gobsmacked/furious, worried (about what little lad had done on the tues & Thurs they'd been out),then furious again.
BIL confronted them, and they really couldn't see what they'd done wrong, after all he'd been no trouble. . . .and they'd never complained. BILs comeback of well we didn't know we were providing free childcare/ being responsible adults for him. And they didn't answer when he asked what had happened to the kid on the days they weren't in, sent him home.
BIL still gets very agitated when it's mentioned, lots of 'well if they'd asked we'd have done it' 'why didn't they just ask? '
Being the big softies they were when little lad didn't show the next Tue they worried where he was, found out later that he'd started calling on a different family, as DSis & Bil had 'banned' him according to new family. And worst told little lad that DNs didn't want to play with him anymore.
DS did put them straight though.