According to my SIL anyway
Every year we take them to eurocamp (or similar) We take the eurotunnel and have traveled all over France, Italy Netherlands Germany. We stay in a chalet and have wonderful holidays, swimming biking exploring and much more. Our kids are great in the car so it's all no bother and we have a great time.
But no apparently it's only a holiday if you get on plane and stay in a hotel. I'm utterly baffled.