Something also to think about. I'm not sure how your sisterhood is structured. But several of them have an office that handles "Sisterhood Improvement". You might sugguest some activites that might help to strengthen the bonds between the sisters. Many times catty-ness between groups is due to the walls that many of us have built around us still existing between sisters. One activity that might strengthen bonds can be as simple as for a dinner (given that you have a house and a monthly/weekly dinner), have assigned seating seperating those that typically sit together.