All living members of the Romanov Family today are descendants of Emperor Nikolai I.
The four lines of the Romanov Family are named after the Emperor's sons:

• The descendants of Emperor Alexander II (the "Alexandrovichi")
• The descendants of Grand Duke Konstantin Nikolaevich (the "Konstantinovichi")
• The descendants of Grand Duke Nikolai Nikolaevich (the "Nikolaevichi")
• The descendants of Grand Duke Mihail Nikolaevich (the "Mihailovichi")

Sometimes the so-called "Vladimirovichi" (the descendants of Grand Duke Vladimir Alexandrovich) and the "Pavlovichi" (the descendants of Grand Duke Pavel Alexandrovich) are listed as separate lineages, although both Grand Dukes are sons of Emperor Alexandr II.

The claimant to the Throne, Grand Duke Georgi Mihailovich, belongs to the "Alexandrovich" (or "Vladimirovich") line of the Romanov Family. The head of the Romanov Family Association, Prince Nikolai Romanovich Romanov, belongs to the "Nikolaevichi".