Former Spanish King Juan Carlos, center, and Spain’s former Queen Sofia, sister of former king of Greece Constantine II arrive at Metropolitan Cathedral for the funeral in Athens, Monday, Jan ...

Juan Carlos supported his wife, Queen Sofia, who is the sister of the late Greek King Constantine II. Felipe's sisters, Infanta Cristina and Infanta Elena also supported their mother, Queen Sofia ...

Juan Carlos held onto Felipe's hand outside, to help him stay up, and inside St George's Chapel as they were seated. Felipe's mother Queen Sofia, 85, is Constantine's older sister.

What's more, Spain's disgraced former King Juan Carlos ... Today's service at St George's Chapel is being held in honour of King Charles' close friend and second cousin Constantine II, ...

Former King Juan Carlos I of Spain and the former King of Greece are related through marriage. King Juan Carlos, father of the reigning King Felipe VI of Spain, is married to Constantine’s sister, ...

Constantine’s father, King Paul, was a first cousin to Prince Philip and father-in-law to Juan Carlos I of Spain. Constantine was also godfather to Prince William.

His older sister Sophia is the wife of former King Juan Carlos I of Spain. The Greek-born Prince Philip, the late Duke of Edinburgh and husband of the United Kingdom’s late Queen Elizabeth II ...

King Felipe and former monarch Juan Carlos I attended King Constantine's funeral in Athens on 16 January. The Spanish royal family attended Constantine II's funeral in Athens.

Constantine was born June 2, 1940 in Athens, to Prince Paul, younger brother to King George II and heir presumptive to the throne, and princess Frederica of Hanover.

Like so many royals, King Constantine II of Greece, who died this week aged 82, was closely related to the other kings and queens of Europe. Both through birth and through marriage, Constantine had ...