I don't think you need bank details and employment letters. But just in case maybe you want to have a bank statement with you, although again, they should only care about flight details and accomodation.

I don't think brexit has anything to do with your german visa. You just have to respect the rules, pay your taxes there, have your paperwork in order and when you are eligible then you apply.

Any update? Did you get to make your trip? Any more reasons you got for visa rejection? What passport do you have?

Your brother needs a tourist visa. What kind of passport does he hold?

No experience but since you got refused I think you should just go ahead with tourist visas untill you proceed with the adoption. Or apply again in London?

So it didn't take that long, that's good to know, thanks for the update.

While EU/EFTA citizens have the right to freely move to Portugal, they must request a registration certificate if they stay for longer than three months. EU citizens can also request a permanent residence certificate after five years. The situation for UK citizens may change following the UK’s exit ...

If you applied for a replacement of BRP you should have a proof of that so just go and ask if you can go ahead with the application based on that.

Her visa is valid in all Schengen space, besides if you won't leave the airport it should be fine.

It may be simple for her since is her country, same for the kids but for you not so simple specially if UK will exit, then all the rules change. Better take a trip to latvian embassy and ask for advice.