Пётр Петрович
Prince Ilia's surviving male-line descendants are through his son, Prince Grigoriy Gruzinsky, whose great-grandchildren reside in Russia. The only living male member of the line is the Moscow-born Evgeny Petrovich Gruzinsky (born 1947), a son of the Soviet naval officer Pyotr Petrovich Gruzinsky (1916–2006) by his wife Raisa Sergeyevna Yasinkov-Maletskaya (1923–1987). Based on the principle of primogeniture practiced by the Georgian royal family, he can be considered heir presumptive to Nugzar Bagration-Gruzinsky, a scion of Ilia's elder brother Bagrat, who claims headship of the Royal House of Georgia and has no son.