This question is sort of hard to answer, because Alice doesn't remember anything from her past, so she doesn't know what year she was born, but she was the last (Along with Jasper and besides Bella) that joined the Cullens. And then Bella joined.
There is no Cynthia Cullen, but there is another Cynthia who is Alice's real sister.
Alice Cullen, the 'sister' of Edward Cullen
Alice Cullen has short brown hair.
Jade Cullen is Renesmee's little twin sister who has craved the love her sister gets. She feels as if no one loves her, wants her, or as if she is the "evil twin".
Rosalie Hale as a human then became a member of the Cullen clan
she is the sister of Edward Cullen
Since she's Alice Cullen, I'd go with the Cullen family.
She has rosalie but in the fourth book Bella and edward get married then she has Bella as a sister in law.
Edward's favorite vampire sister or brother is Alice Cullen.
Edward Cullen is 108 and Rosalie is 98. he is really 17. When he was a human he had a sister,Janelle,she was just 15 when he "died''. she became a volturi guard when she was changed at age 22,by james.
I don't really Know, But I think Alice Cullen thinks of Bella Swan as Her Sister! I think Alice and Bella are sister's in A way that there Great Friend's but yeah, there nice to each other, they both think of each other of Sister's!
It doesnt tell us. Sorry