Notes:
a) Marie of Hesse- Darmstadt is mother of: Alexandra Alexandrovna Romanov (*1842), Nicholas Alexandrovich Romanov (*1843), Alexander III Alexandrovich Romanov (*1845), Vladimir Romanov (*1847), Alexis Romanov (*1850), Marie Alexandrovna (*1853), Serge Alexandrovich Romanov (*1857) and Paul Alexandrovich Romanov (*1860)
b) Catherine Yourievska is mother of: George Romanov (*1872), Olga Romanov (*1874) and Catherine Romanov (*1878)