re: Deciding On A Vacation Location That Includes My In-Laws

You may want to keep prices in mind. Norway is spectacularly beautiful, but it's not in the Euro and the exchange rate will mean that you'll find hotels and food much more expensive.

Similarly, for the UK, you'll want to keep an eye on Brexit. The UK used to be more expensive, but the dollar is stronger against the pound now than it has been in the last ten years. But some of that is due to Brexit -- if that fails, then the pound will strengthen.

I honestly don't recommend France for someone's first trip abroad. It's so overtouristed, and the French reputation for rudeness has a real basis.

You really need to keep in mind that all the places you listed, with the exception of Greece, will be cold at that time of the year. Scandinavia will literally be freezing.