The Royal House of Ghassan is officially recognized by the government of the Lebanese Republic by the presidential decree 5,800/2019 signed by the president, the prime minister, and voted unanimously by the cabinet of ministers.
Obviously, this recognition is from a historical and cultural perspective since no republic would recognize sovereign rights of a dynasty that previously ruled part of its territory.
Since no longer ruling, the Royal House of Ghassan is an NGO officially accredited by the United Nations with the Special Consultative Status since 2016. There’s no other legal way available for such recognition neither in the domestic nor in the international law.
The recognition of the royal character of the dynasty can be proven by multiple ways. First and foremost, the history of the El Chemor family is vastly documented for hundreds of years and its princely status do not depend on the blood-link with the Ghassanid kings since the family ruled two sovereign principalities in today’s Lebanon (Al-Akhoura 1211-1633 and Zagharta-Zewiye 1641-1747).
Second, all the regimes since the Ottoman Empire have recognized the family’s titles having them mentioned on official documents like land deeds, testaments, passports, etc. until the present day.
HIRH Prince Gharios El Chemor of Ghassan Al-Nu’man VIII is recognized by the government as such being invited for official events under the patronage of the president and the ministry of foreign affairs and emigrants.
Corroborating all of that, the Lebanese leading newspaper An-Nahar (founded in 1933) article commenting on the Presidential agenda citing the Royal House of Ghassan delegation and addressing Prince Gharios by the title (May 8th 2017)
The original article can be accessed here https://www.annahar.com/arabic/article/580869-%D8%B9%D9%88%D9%86-%D9%87%D9%86%D8%A3-%D9%85%D8%A7%D9%83%D8%B1%D9%88%D9%86-%D9%88%D8%A7%D8%B3%D8%AA%D9%82%D8%A8%D9%84-%D9%84%D8%AD%D8%A7%D9%85-%D9%84%D8%A8%D9%86%D8%A7%D9%86-%D9%88%D9%81%D8%B1%D9%86%D8%B3%D8%A7%D8%A7-%D8%B3%D9%8A%D9%88%D8%A7%D8%B5%D9%84%D8%A7%D9%86-%D8%A7%D9%84%D8%B9%D9%85%D9%84-%D9%85%D8%B9%D8%A7-%D9%85%D9%86-%D8%A7%D8%AC%D9%84-%D8%A7%D9%84%D8%A7%D8%B3%D8%AA%D9%82%D8%B1%D8%A7%D8%B1-%D9%81%D9%8A
More about the An-Nahar newspaper here https://en.m.wikipedia.org/wiki/An-Nahar
Lebanese TV announcing that the Royal House of Ghassan was officially received by the President of the Republic
The historical presidential visit happened thanks to sheikh Dr. Naji Gharios, a member of the Royal Family and, in 2017, a member of the Lebanese Parliament