£2000 seems to be a hell of a lot of money tbh, what kind of holiday is it? I mean if they are 50/50 on the kid which I agree they should be, then that's £4000, am not even £2000pp for a Walt Disney/universal holiday
I feel like maybe they are taking the piss a bit, I think for kids you should be 50/50 on what would be the essentials, clothes, school things, shoes etc but when it comes to bdays, Xmas an holidays then it's up to the parent themselves to provide everything, like a present from each for bday an Xmas (unless the kid has asked for something an it's incredibly expensive) an if the parent decides to go on holiday then it's up to them to pay for the kid themselves