It was the first form of family law which would stay relevant for decades afterwards; it was also the only family law treaty that was expressly preserved and revived in the Treaty of Versailles and other post World War I peace treaties.
The Guardianship Convention was written only in French and, with the Boll case, is the only Convention of the Hague Conference to ever be the principal subject of interpretation before a court with worldwide jurisdiction.
As of 2016, seven states are party to the convention: Belgium, Italy, Luxembourg, Poland, Portugal, Romania and Spain.
Six others: France, Germany, Hungary, the Netherlands, Sweden and Switzerland have denounced the convention.
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