

We only had to deal with three EU countries and it was already messy. We are married, but kept separate family names. One of the three countries did not allow the kids to have the mother’s family name (yeah equality…/s), so we had to go with the father’s family name.
I assume you already checked your situation, but few countries accept “the right of land”, aka citizenship upon birth in that country, so we didn’t have to deal too much with the country with were in. Except for filling in the birth certificate that generates all other documents.



It is not unusual to get a partnership recognized just for this reason. (I honestly have a very down to earth view on marriage, so I’m all for getting married for the papers)