Dd is 20y and still comes away with us once or twice a year. She's a student and we pay for her. We have the money to do so that isn't an issue.
We give her the option when we book our holidays and so far she's always said yes. She loves holidays and travelling and relishes the idea of getting to go further afield and stay in nicer accommodation than when she goes with friends. When she comes with us she gets upgraded food, drink, hotels and day trips than what she gets when she holidays with friends. Best of both worlds!!
She also goes away with friends too. That comes out of savings she makes from her monthly allowance she gets from us, rather than us paying extra on top.
Almost all of DD's friends go away on holidays with their parents at least once a year.
It's lovely to have that family time away. We are off to Malaysia for a fortnight soon, the three of us, and we are all really looking forward to it. It's still a grown ups holiday for us as Dd is also an adult and one we get on very well with.
Dd is already planning next years summer break with us, plus a Christmas market trip together and possibly a wider family few days away around Easter time. No doubt she will go away with friends either later in the year or early next year for a few days in Europe. Although many can't afford it right now so she's even considering if her grandma fancies a few days away for a curt break sight seeing. So it isn't just mum and dad she's happy to holiday with here!