Anatole Boris Julien Grisonas was born in Montevideo on 25th September 1972.

Her father, Mario Roger Julién Cáceres was a Uruguayan citizen who worked as a graphic artist and studied at the School of Fine Arts. His mother, Victoria Lucía Grisonas Andrijauskaite was born in Argentina but had lived in Uruguay from a young age. Victoria and Mario were both militants of the Federación Anarquista de Uruguay (Anarchist Federation of Uruguay) and they married in 1968. Once the coup d'état hit Uruguay in 1973, Mario and Victoria settled in Buenos Aires with refugee status from the UN High Commission for Refugees (UNHCR). There, they participated in the formation of the leftist Partido por la Victoria del Pueblo (Party for the Victory of the People, PVP).

On 9th May 1975, the couple welcomed their second child, Victoria Eva. The family was living in a house situated in the locality of San Martín, in the Province of Buenos Aires. 

During the afternoon of 26th September 1976, a large deployment of heavily armed Argentine and Uruguayan forces targeted the family home. The repressors fired at the house and cut off the lights and phone lines, deploying a parade of military vehicles, including two tanks, to block either end of the street. 

Marío presumably attempted to escape but was intercepted. It was originally thought that he had committed suicide, although the Argentine courts concluded that he was assassinated during the operation itself. Victoria was captured alive and was taken with her children to the Automotores Orletti clandestine torture and detention centre, where they stayed for around 10 days.

On 7th October 1976, Anatole and Victoria were secretly transferred to Uruguay by aeroplane, where they were captured at the headquarters of the Servicio de Información de Defensa (Defence Information Service, SID) on Bulevar Artigas Street in Montevideo city. During his testimony, former soldier Júlio César Barboza, who exercised functions within the SID, mentioned children in a ground-floor room who were looked after by a pregnant prisoner. This young woman was María Claudia García Iruretagoyena de Gelman, who had also been transferred from the Automotores Orletti detention centre. 

In November, they were taken to the house of a SID sergeant who belonged to a group of kidnappers. From there, they were flown to Chile, guarded by military personnel. The repressors abandoned them during the early hours of the morning of 22nd December in O'Higgins Square, in the port city of Valparaíso, Chile. The owner of the rides in the playground area allowed the unaccompanied children to play on some games. He noticed from their accent that the abandoned toddlers were not Chilean and reported them to the Carabineros, Chile's military police, and the local police. The children were taken to an orphanage and a juvenile judge was informed of the situation. 

On 29th December 1976, the Chilean newspapers published a photo of the two children sat on a bench in O'Higgins Square. The impact of this mysterious encounter of the two abandoned children with a River Plate accent spread throughout the community. Anatole and Victoria were finally taken in by a Chilean couple who were detached from the repressive apparatus of the Pinochet regime. Meanwhile, their paternal grandmother, María Angélica Cáceres, began her search for the children, which she coordinated with Argentine and Uruguayan institutions alongside international organisations.

In 1979, María Bernabela Herrera Sanguinetti- a Uruguayan citizen in charge of the Chilean office of the United Nations High Commission for Refugees (UNHCR)- received a letter from a French organisation that worked with migrants and refugees called La Cimade. The letter provided a tip-off from a Chilean social worker working in Venezuela who identified a photo of the Larrabeiti Yáñez siblings with two children who she had seen in Valparaíso.

María Bernabela Herrera asked the Brazilian human rights NGO Clamor, which worked with the UNHCR and had a branch office in Valparaíso, to verify the information. Clamor immediately verified the claim and contacted the children's grandmother, Angélica Cáceres, who travelled to Valparaíso in July 1979.

This process allowed Anatole and Victoria to know their true identity and to be reunited with their grandmother. The children grew up in Chile but made regular trips to Uruguay to reconnect with their biological family. Their parents, however, remain disappeared.

The Grisonas family's case was investigated in the five 'Automotores Orletti' trials and the mega-causa (large criminal proceeding comprising numerous victims and perpetrators) against Operation Condor.

The siblings, Anatole and Victoria, continued living in Chile and brought their case before the Inter-American Court and Commission of Human Rights (IACHR). The latter trial condemned the Argentine state on 23rd September 2021 for its responsibility for the crimes committed against the family.