[daikokunyo]

i don't know about the Alice in Wonderland disney movie, but the original book by Lewish Carroll was written for the amusement of a child Lewis Carroll was friends with called Alice Liddell. The character Alice was supposed to be based on herself to some extent. her father was the Dean of an Oxford college so it's safe to say that the real Alice, at least, was definitely from an upper-class family of the time. (She had two sisters, Edith and Lorina, and they make brief appearances in Alice in Wonderland too. Lorina is the Lory and Edith is the Eaglet.)
Also Lorina was her older sister, so Alice's older sister in the story may be based on her.