Why is the older sister strongly disliked? Why is the younger sister favored? I don't know enough about the story to give you advice, but I think there would be a bit of resentment on the older sister's part. I need more details, though.
"An intellectual says a simple thing in a hard way. An artist says a hard thing in a simple way." -Charles Bukowski
"And by the way, dearie, your punctuation sucks canal water!" -The ghost of Vivian Vance