I think I'll post the siblings one next.
Another idea (some credit to Maya):
Descendants , forgotten Disney princesses/non Disney.
The other descendants meet them.
Belle/beast and Ben= Kayley/Garrett and their son/daughter (Daughter taken by me.)
Aurora/Philip and Audrey= Odette/Derek and their daughter
Mulan/Shang and Lonnie= Tigerlilly/? And her daughter
Dopey and Doug= Kida/Milo and their son
Fairy godmother and Jane= Eilonwy/Taran and their son
Cinderella/Charming and Chad= Anastassia/Demetri and their son
New= Nita/Kenia and their daughter
Maleficent and Mal= Rothbart and his daughter(taken by me.)
Evil Queen and Evie= Ruber and his daughter
Jafar and Jay= Rasputin and his son
Cruela and Carlos= Commandor Rourke and his son.
New= The Horned king and his daughters (one taken by me.)(one saved for Maya, if she wants it.)
Mal(saved for Maya.)
Evie(saved for Cara.)
Isle of the lost= the forbidden Forrest
I'm not sure whether Rothbart or The Horned king would be better as the Maleficent spot.....