Prince Carl Philip, Duke of Värmland, is the only son of King Carl XVI Gustaf and Queen Silvia of Sweden. He is the fourth in line to the Swedish throne and holds the title of Duke of Värmland. He is a member of the Royal House
From Wikipedia
Prince Carl Philip of Sweden, Duke of Värmland is the only son and the second of three children of King Carl XVI Gustaf and Queen Silvia. As of 2022, Prince Carl Philip is fourth in the line of succession, after his older sister, Crown Princess Victoria, his niece and goddaughter Princess Estelle, and his nephew Prince Oscar. He lives with his wife, Princess Sofia, and four children in Villa Solbacken in Djurgården, Stockholm.