Comment by 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).