[PeterisP]

From what I understand of German law, all of you may have lost your German citizenship, depending on how you handled the Croatian and Swiss paperwork - Germany allows for dual citizenship at birth, however, obtaining any other citizenship means loss of German citizenship unless you have obtained a specific “Beibehaltungsgenehmigung” permit beforehand; so the German passports you have might be legally not valid if you haven't filed for and obtained this permit in both cases (which you hopefully have done).

[mrsaint]

The Beibehaltungsgenehmigung is outdated in this regard. See https://en.wikipedia.org/wiki/Beibehaltungsgenehmigung

[PeterisP]

Ah, okay, it does not apply for EU nations (like Croatia) and Switzerland, so it's not a worry for the OP and would matter only if other countries would be involved.

[dualthro]

Croatia will be joining the EU in 2023 afaik.

edit: seeing multiple other comments here that is already a member so I guess I am mistaken

[mrsaint]

It will join the Schengen area next. Also it plans to adopt the euro in 2023.