Take a quick look at the JASNA website where a select bibliography on “Austen’s Siblings in Fact and Fiction in JASNA Publications” has been posted ~ all in preparation for the upcoming AGM in Philadelphia, City of Brotherly Love. All the articles are in JASNA publications, many with online links.
Here is a taste to start your reading adventure:
Tthe facts: “Austen Brothers and Sisters” by Park Honan. Persuasions 10 (1988): 59-64.
The fiction: “Sisterhood and Friendship in Pride and Prejudice” by Deborah J. Knuth. Persuasions 11 (1989): 99-109.