I got sisters?

suggested I try draw these 3. Haha poor Mavy so lost finding out she's not an only child. Well I did read somewhere Dracula had more than one wife. I honestly don't know much about Sibella and Draculaura. All I know is from seeing Scooby Doo and the Ghoul School I think twice and both were half the film and I only know Draculaura from the dolls but I hear there's a show I don't know.

Mavis (Hotel Transylvania)
Sibella (Scooby Doo and the Ghoul School)
Draculaura (Monster High)