I'll try and keep this short - have no idea what to say to them both!
So my niece is a v lovely girl, mega hardworking, got straight A*s at GCSE and heading for all As at AS level, grade 8 instrument etc etc. She went to an absolutely appalling state comp, zero facilities, was picked on for being clever, really miserable for her. Is now at a better state sixth form and much happier. SIL has just told her that they will be sending her younger brother (only sibling) to private school from 11 and Niece has gone absolutely bonkers. They've had a huge row, SIL is genuinely shocked that niece is taking it badly but when I heard them explaining the problem I couldn't help but see niece;s side...she's saying it feels like her brother is getting better treatment, she's saying it's really unfair because he's lazy (this is true, his school reports have hardly been glowing) and why didn't she get the chance to go etc etc. SIL is simply saying she doesn't have to justify herself (or BIL) to a 17 year old which seems to only antagonize niece even more. They asked me to talk it through with them...I've delayed for a few days to have a think! Help?!?!?!?!
FWIW..all my kids are/will be at private school so I can obviously see the benefit, but I wouldn't send just one of the four....