He was a son of Prince Pyotr Aleksandrovich Gruzinsky and a scion of King George XII of Georgia and his wife, Tamara Dekanozishvili (1897-1977), daughter of a Georgian noblemen, whose family held the title of Aznauri.
Petre's literary career began in 1933, under the penname of Tamarashvili.
[2] Gruzinsky was arrested and tried on charges of anti-Soviet activities and monarchist plot in 1945 and confined in a mental facility until released in 1948.
[citation needed] Many of his literary works afterwards were published under the names of Gruzinsky's wife Liya Mgeladze and the journalist Irakli Gotsiridze.
He married in 1939 Ketevan Siradze (born 9 April 1915), daughter of Filimon Siradze, and had a daughter: In 1944, Gruzinsky married his second wife, Liya Mgeladze (born 19 August 1925, Manglisi), daughter of Dimitri Mgeladze (1889–1979), the literary scholar and former member of the government of the Democratic Republic of Georgia.