There are multiple royal families in the United States of Auradon. This is because it used to be separate kingdoms until Belle and King Beast (Adam) united them and got elected King and Queen. However the other Royal Families remained to have their titles.
Auradon's Royal Family
The first King of Auradon was King Beast, he and Queen Belle united the kingdoms of Auradon. Queen Belle isnt royal born, she is the daughter of inventor Maurice and her mother is named Colette according to some. Par 2015, their sixteen year old son Ben was crowned in the Auradon Cathedral and so he became the current king.
Auroria's Royal Family
The Royal family of Auroria, goes back hunderds of years as Princess Audrey mentioned. The Current King and Queen are Audrey's parents: King Phillip and Queen Aurora. Queen Aurora is the daughter of Queen Leah and King Stefan. Since she was a baby she has been engaged to Prince Phillip, who's father King Hubert was a good friend to Stefan. Aurora was raised however in the forest as a peasent girl out of fear for Maleficent. There she fell in love with Phillip without knowing who he really was. Auroria is located in the South Riding.
Cinderellasburg's Royal Family
Cinderellasburg is named after its current queen: Queen Cinderella, the wife of King Charming. Queen Cinderella wasn't born a royal, although she was the daughter of a noblemen. The King and Queen have one son: Chad Charming.
Charmington's Royal family
Charmington is ruled by Snow White and King Florian. Beside being a queen, Snow White is also a live news reporter who reported King Ben's coronation. There isn't much known about Florian's family beside the fact that it is pure royal. Snow White is also born royal, and stepdaughter to Evil Queen Grimhilde.
Due to Snow White's relationship with her step-mother ending on the death of her father, she and Evie are no relation. Evie is merely Snow White's step-mother's daughter.
Tangletown's Royal family
Tangletown, formerly known as Corona, was ruled once by King Frederic and Queen Arianna. Their daughter Rapunzel was lost for 18 years because she was kidnapped by Mother Gothel. Now she and Eugene Fitzherbert rule it. They have two daughters: Anxelin and Ruby.
Bayou de Orleans's Royal family
Bayou de Orleans was formely known as Maldonia, the current rulers are King Naveen and Queen Tiana. Queen Tiana was not born royal. King Naveen also has a younger brother, Prince Ralph.
Agrabah's Royal family:
The Sultan and Sultane of Agrabah are Aladdin and Jasmine. Aladdin was a streetrat once and son to Cassim. Jasmine was the daughter to a Sultan and a deceased Sultane. Aladdin and Jasmine have one child: Prince Aziz.