Use "great-niece" in a sentence

1. Sometime after Demetrius married his great niece, Apama and Demetrius became lovers.

2. The 2nd Countess Mountbatten of Burma, great-great-granddaughter of Queen Victoria, great niece of Russia’s last Tsarina, first cousin to Prince Philip and the daughter of Britain’s last Viceroy of India, the late Patricia Edwina Victoria Mountbatten was born in 1924 into a dynasty of royal and political relations