Swedish Royal family and their partners were attending a seminar to mark Queen Silvia's upcoming 75th birthday at Oscar Theater on December 18, 2018

Princess Sofia of Sweden looks very Christmassy in flattering midi length skirt Lilli Jahilo 'Adele' red dress, teamed with red heels and black clutch as she attends for an event marking Queen Silvia's 75th birthday in Stockholm

The Royal couple Queen Silvia (2nd-R) and King Carl Gustaf of Sweden with their daughter-in-law Princess Sofia, right. They were also joined by their granddaughter and second-in-line to the throne, six-year-old Princess Estelle, left

Princess Madeleine stunned in a £1,260 Alexandra floral matelassé dress from British label Erdem teamed with black suede courts, for the festive get-together in Stockholm for an event held in honor of her mother Queen Silvia's upcoming 75th birthday

(L-R) Prince Daniel, his wife Crown Princess Victoria, daughter Princess Estelle and Queen Silvia in Stockholm today, December 18, 2018, for a seminar marking the queen consort's upcoming 75th birthday

Sweden's Queen Silvia, who is marking her 75th birthday, looked remarkably youthful in a fuschia buttoned skirt suit teamed with a glittering brooch with husband King Carl Gustaf who look dapper in a dark stripe double breasted suit,teamed with white shirt and blue tie in Stockholm for an event held in honor of the Queen's upcoming 75th birthday

(L-R) Sweden's Princess Sofia, with her husband Prince Carl Philip and her sister-in-law Princess Madeleine, attending a seminar to mark Queen Silvia's upcoming 75th birthday in Stockholm.  It was announced earlier this year as part of the consort's ongoing birthday celebrations 2018, which will include a reception at the Royal Palace on Wednesday.

The royal couple of Sweden Queen Silvia and King Carl Gustaf arrive at Oscar Theater for today's seminar. Queen Silvia has recently taken part in a series of documentaries to mark her 75th birthday, and during a rare interview this week she admitted it was 'a big shock' to learn of her father's Nazi links following his death in 1990

Swedish royals L-R: Prince Daniel, Crown Princess Victoria, Princess Estelle, Queen Silvia, King Carl XVI Gustaf, Princess Sofia, Prince Carl Philip, Princess Madeleine and Chrisopher O'Neill descend on Oscar Theater in Stockholm for a seminar on 18 December 2018

The Swedish Royal Family: King Carl XVI Gustaf (born in 1946) and Queen Silvia (born in 1943) are the head of the Swedish royal family, also known as the House of Bernadotte.
Crown Princess Victoria, Duchess of Västergötland (born in 1977), is their eldest daughter and heir to the throne. She is married to Prince Daniel, Duke of Västergötland, and they have Princess Estelle, Duchess of Östergötland, born 2012, and Prince Oscar, Duke of Skåne, born 2016.
Their eldest son is Prince Carl Philip, Duke of Värmland (born 1979). He is married to Princess Sofia, Duchess of Värmland, and they have Prince Alexander, Duke of Södermanland, born 2016, and Prince Gabriel, born in 2017.
Their youngest daughter is Princess Madeleine, Duchess of Hälsingland and Gästrikland, born 1982, who is married to Christopher O'Neill. They have Princess Leonore, Duchess of Gotland, and Prince Nicolas, Duke of Ångermanland, born 2015, and Princess Adrienne, born in 2018. The couple recently swapped London for Florida.
Princess Birgitta is also a member of the Royal House. She is the King's second sister and the widow of Prince Johann Georg of Hohenzollern.
Princess Margaretha, Mrs. Ambler, the King's first sister, and his third sister, Princess Désirée, Baroness Silfverschiöld, who is married to Baron Niclas Silfverschiöld, and Princess Christina, Mrs. Magnuson, who is the King's fourth sister and married to Consul General Tord Magnuson, are also members of the Royal Family.
The King's aunts, Marianne Bernadotte, Countess of Wisborg, and Gunnila Bernadotte, Countess of Wisborg, are also listed.

Sweden's Prince Carl Philip with wife Princess Sofia who looked ravishing in crimson as they joined The Swedish Royal Family for today's seminar which was held in the Swedish capital

Princess Madeleine of Sweden, who is believed to be spending Christmas in Sweden this year 2018, recently moved to Florida with her husband and three young children

Crown Princess Victoria, who will one day be Queen of Sweden, looked elegant in a navy dress featuring a pie crust collar and delicate red and white floral detail

Princess Madeleine of Sween looked chic in an Erdem Aleena Floral Matelassé Dress teamed with black suede courts and a fashion-forward black dress featuring an oversized ruffle

Swedish Crown Princess Victoria looked elegant in a navy dress, her outfit featured a pie crust collar and delicate red and white floral detail

Sweden's Prince Carl Philip and wife Princess Sofia who dazzled in a crimson Lilli Jahilo midi dress that was cinched in at the waist and blouson bodice, attends the seminar which was held in the Swedish capital.

(R-L) Johnny Ludvigsson, chairman of the Swedish Child Diabetes Foundation, appeared to hand Queen Silvia and Carl XVI Gustaf of Sweden a hamper before they parted.

(L-R): Prince Daniel, Princess Estelle, Crown Princess Victoria, King Carl XVI Gustaf and Queen Silvia, who celebrates her 75th birthday this month, wave to onlookers

Queen in the making! Six-year-old Princess Estelle of Sweden pictured with parents Prince Daniel and Crown Princess Victoria is second-in-line to the throne after her mother and will one day replace her grandfather King Carl XVI Gustaf as head of the state

Pretty in pink! Six-year-old Princess Estelle of Sweden wrapped up warm in a blush coat as she joined her family for a day out in Stockholm, where temperatures plummeted to 0 degrees today, December 18, 2018

Sweden's Prince Daniel and Crown Princess Victoria are joined by their six-year-old daughter Princess Estelle for Queen Silvia's 75th birthday seminar in Stockholm on December 18, 2018

Sweden's Queen Silvia, pictured in Stockholm last week, in an elegant emerald green gown with a lace bodice and sleeves paired with the Queen Sofia’s tiara (also known as the “Nine-Prong Tiara.”) with over-the-top green jewels, which perfectly matched her emerald dress during the Nobel Prize banquet 2018.  She has admitted it was 'a big shock' to learn of her father's Nazi links following the late businessman's death in 1990

Sweden's future Queen Silvia Sommerlath holds her father's hand in a childhood photo. Revelations about Sommerlath - who was living in Brazil at the time he joined the Nazi party and only returned to Germany on the eve of war - plunged the royal family into crisis in 2010

Silvia Sommerlath (2nd-L), now Queen Silvia, with her parents Walther and Alice and her brother Joerg at Arlanda airport, two days ahead of her wedding to Swedish King Carl XVI Gustaf in 1976

Sweden's Queen Silvia, right, arrives with her parents Alice, center, and Walther Sommerlath, left, at the Nobel Prize ceremony in Stockholm in 1981. When she married in 1976 the Queen’s German father denied he had ever been a member of the Nazi party