It's a MIL one and I could really do with some perspective.
We have a DD who is 9 and a half and a DS who is 2 and a half. Since DD was 1, she has had regular sleepovers, days out, even the occasional short (UK) holiday with MIL. This time last year, MIL watched both the children at our house for a few hours while me and DH went out. That is the ONLY time she has spent any time with DS without us there, AND she went home early and called a family friend to sit with them instead. We phoned her to say we were leaving and she said "Oh I've gone home, had to get back for the dogs. I phoned X and she came round to sit with them."
Today, (well, technically yesterday now considering the time :o ) she phoned DH and said in 2022 she wants to take DD to Florida (I guess to Disney) for 3 weeks. If it's relevant, this trip will be paid for by BIL (who will also be going along with his son the same age as DD). My first reaction was to say hell no, she takes both or neither. I'm sure DS will soon start to notice that DD frequently goes to grandmas without him and at 4 he will definitely understand that grandma took his sister on a big holiday and he was left behind.
I'm really torn because it's a trip of a lifetime and DD would have a fantastic time, but we'd never be able to afford to do anything like this so DS will almost certainly miss out on doing it at all which just isn't fair. DH said we could take DS away for a week when DD is away but it's not the point.
WWYD? Would you be angry? Am I right to be angry at this?