What is the relationship between the main characters of Princess Cece?

The movie Princess Sissi mainly tells the story of two aunts and cousins who are linked by royalty, and the relationship between the main characters in the film is not complicated. Simply comb for the woman and the man: the woman: Princess Sisi picture 1 Sisi mother: Princess belonging to Bavaria, Prussia; Cece's father: a Bavarian duke in Prussia, whose social status is lower than that of his mother. Sissy's sister: Princess Helen (inherited the title of mother). Figure 2 (Sisi's father and brothers and sisters live an idyllic life in their hometown) Figure 3 (Sisi's mother is a Bavarian princess) Man: King Flantz Figure 4 Flantz's mother: Austrian Queen Sophie, who passed the imperial throne to her son Flantz; Father: The Duke in name only. (This is very similar to the Queen of England and Prince Philip today) Picture 1 (Austrian Queen Sophie) The relationship is crossed: Flantz and Sisi are cousins (their mothers are sisters); The picture below shows the sisters gathering in Vienna. Fig.2 Xixi's sister Princess Helen should have been Flantz's wife. The picture below shows her being invited to an appointment by the Austrian government. Figure 3 Unexpectedly, when Flantz, who was only 18, met her cousin Cici, who was only 15, for the first time, they fell in love at first sight and decided to get engaged and get married the next year. Figure 4 Figure 5 Queen Sophie is very critical of Cece. Figure 6 This change makes my sister Helen disappointed and sad. The mothers of both sides (that is, the sisters) can do nothing but accept this embarrassing fact.