Royal Family Around the World: Spanish Royals Attend 25th Anniversary of King Juan Carlos' Father's Death at San Lorenzo del Escorial Monastery on April 3, 2018 in El Escorial, Spain.

Infanta Cristina of Spain attends a Mass in occasion of the 25th anniversary of the death of Conde de Barcelona, father of King Juan Carlos, at San Lorenzo del Escorial Monastery on April 3, 2018, in El Escorial, Spain.

Infanta Elena of Spain attends a Mass in occasion of the 25th anniversary of the death of Conde de Barcelona, father of King Juan Carlos, at San Lorenzo del Escorial Monastery on April 3, 2018 in El Escorial, Spain.

Infanta Cristina of Spain and Princess Alexia of Greece (L) attend the mass to mark the 25th Anniversary of the Count of Barcelona's death at the monastery of El Escorial on April 3, 2018, in El Escorial, Spain. The Count of Barcelona, Don Juan de Borbon, is the father of former King Juan Carlos.

Infanta Elena attends the mass to mark the 25th Anniversary of the Count of Barcelona's death at the monastery of El Escorial on April 3, 2018, in El Escorial, Spain. The Count of Barcelona, Don Juan de Borbon, is the father of former King Juan Carlos.

Infanta Cristina of Spain (L) and Princess Alexia of Greece (R) attend a Mass in occasion of the 25th anniversary of the death of Conde de Barcelona, father of King Juan Carlos, at San Lorenzo del Escorial Monastery on April 3, 2018, in El Escorial, Spain.

Infanta Cristina of Spain (L) and Princess Alexia of Greece (C) attend a Mass in occasion of the 25th anniversary of the death of Conde de Barcelona, father of King Juan Carlos, at San Lorenzo del Escorial Monastery on April 3, 2018, in El Escorial, Spain.

Infanta Cristina of Spain (front-C) and Princess Alexia of Greece (back-R) attend a Mass in occasion of the 25th anniversary of the death of Conde de Barcelona, father of King Juan Carlos, at San Lorenzo del Escorial Monastery on April 3, 2018, in El Escorial, Spain.

Infanta Elena of Spain (L) and Infanta Cristina of Spain (C) attend a Mass in occasion of the 25th anniversary of the death of Conde de Barcelona, father of King Juan Carlos, at San Lorenzo del Escorial Monastery on April 3, 2018, in El Escorial, Spain.

Princess Kalina of Bulgaria and husband Kitin Munoz attends a Mass in occasion of the 25th anniversary of the death of Conde de Barcelona, father of King Juan Carlos, at San Lorenzo del Escorial Monastery on April 3, 2018, in El Escorial, Spain.

Princess Kalina of Bulgaria attends a Mass in occasion of the 25th anniversary of the death of Conde de Barcelona, father of King Juan Carlos, at San Lorenzo del Escorial Monastery on April 3, 2018, in El Escorial, Spain.

Princess Ana of Francia attends a Mass in occasion of the 25th anniversary of the death of Conde de Barcelona, father of King Juan Carlos, at San Lorenzo del Escorial Monastery on April 3, 2018, in El Escorial, Spain.

Infanta Cristina of Spain attends a Mass marking the 25th anniversary of the death of Conde de Barcelona, father of King Juan Carlos, at San Lorenzo del Escorial Monastery on April 3, 2018, in El Escorial, Spain.

King Felipe of Spain and Queen Letizia of Spain attend a Mass marking the 25th anniversary of the death of Conde de Barcelona, father of King Juan Carlos, at San Lorenzo del Escorial Monastery on April 3, 2018, in El Escorial, Spain.

Don Juan Carlos and Dona Sofía attend a Mass marking the 25th anniversary of the death of Conde de Barcelona, father of King Juan Carlos, at San Lorenzo del Escorial Monastery on April 3, 2018, in El Escorial, Spain.

Queen Letizia of Spain attends a Mass marking the 25th anniversary of the death of Conde de Barcelona, father of King Juan Carlos, at San Lorenzo del Escorial Monastery on April 3, 2018, in El Escorial, Spain.

General view during the Mass marking the 25th anniversary of the death of Conde de Barcelona, father of King Juan Carlos, at San Lorenzo del Escorial Monastery on April 3, 2018, in El Escorial, Spain.

Infanta Cristina of Spain attends the mass for Count of Barcelona's 25th Anniversary's Death at the monastery of El Escorial on April 3, 2018, in El Escorial, Spain. The Count of Barcelona, Don Juan de Borbon, is the father of former King Juan Carlos.

King Felipe of Spain and Queen Letizia of Spain attend the mass for Count of Barcelona's 25th Anniversary's Death at the monastery of El Escorial on April 3, 2018, in El Escorial, Spain. The Count of Barcelona, Don Juan de Borbon, is the father of former King Juan Carlos.

The family gathered to remember Juan, Count of Barcelona, pictured, who died in April 1993

Juan, Count of Barcelona, with his wife the Countess at Claridges in London in 1950

Prince Pedro of Bourbon-Two Sicilies, Duke of Calabria, and his wife, Sofia Landaluce y Melgarejo, also attended. Prince Pedro is of the same Spanish royal house as the late Countess of Barcelona

King Juan Carlos, 80, was joined by wife Queen Sofia, 79, and children for a mass honouring his father Infante Juan, Count of Barcelona, who died in April 1993 at the age of 79

Princess Kalina of Bulgaria and her husband, Kitin Munoz, arrived for the mass on April 3, 2018

King Juan Carlos and Queen Sofia of Spain paid tribute to the late king at the service

King Juan Carlos and Queen Sofia lowered their heads as they crossed themselves during the mass

King Felipe of Spain, who took the throne after his father's abdication in 2014, attended the service with his wife, Queen Letizia of Spain, pictured

Infanta Elena of Spain, arrives for the mass at the San Lorenzo del Escorial Monastery

Infanta Elena of Spain arrived separately to her parents, wearing a black and brown ensemble, as she attends the mass for Count of Barcelona's 25th Anniversary's Death at the monastery of El Escorial

Infanta Elena of Spain arrived, wearing a black and brown ensemble, as she attends the mass for Count of Barcelona's 25th Anniversary's Death at the monastery of El Escorial