Clueless about moving to Portugal with children.. I don't know where to start.

@dally the snag with that is that they won’t pick up Portugueuse and won't make friends. Well online friends, yes, but going to a school is the best way to integrate perhaps?

Having said that, for now, online is good for language. Freya, if you don’t know it already, get them both started on Portugueuse using Duolingo. It's free unless you sign up for a more extensive version, it is Brazilian Portugueuse but it's a great way to just become a little more familiar with the language, it is also great for kids as it is formatted almost as a game. It would be fine for their ages. You can pick up quite a lot of language in just a ten minute session.

Also, while the kids will pick up Portugueuse anyway, they will also find that English is spoken by a lot of Portuguese which will help them initially. They are lucky and privileged, they will become virtually bilingual going over at that age.