Identical Cousins: it's a thing

Just found out that Tsar Nicholas II and his cousin King George V:
https://historycolored.com/photos/5152/tsar-nicholas-ii-king-george-v-together-22-august-1913/#:~:text=Perhaps%20surprising%20to%20people%20upon,Windsor%20Royal%20Family%20of%20Britain.&text=Pictured%20here%2C%20King%20George%20is,their%20relationship%20was%20still%20intact.