Having worked right the way through, under significant pressure (not as much as some but still significant), and not been able to take much leave last year (I carried over 15 days), I need a break.
Dd has some SNs which mean she's a challenging teen. So she needs something to do all the time. We went for a week last summer within the country here with activity locally and it wasn't enough.
We had to cancel a specialised sports camp for her last summer. It is being run again this summer and, if DH and I are vaccinated, we are bringing DD there (it's in mainland Europe) and spending that week in peace in separate accommodation in that city.
There is no respite for us locally and not enough activity if she were to go stay with relatives in other parts of this country but she's too young to work.
So yes, we are being selfish but necessarily so.
We holidayed at home last year, and have done on about 40% of holidays since we've had DD (and a number of years before that too). We will still spend some time doing holiday things here too, as I am taking 6 weeks off on parental leave to support dd. So visiting family and probably going camping as jus the girls etc.
But Dh and I need a break as it has been over 3 years since we've had a break from her due to various family events (including bereavement) and other things. So we really, really need that break. And if we were not to do it abroad, DMIL would expect us both down to her to fill our week with jobs.