I am wondering if you showing her sister that video "Geurilla divorce busting" would help..its only fourty minutes, but it really packs a punch.
That video is designed for family and community members, to inspire them to be supportive and helpful for marriages in trouble. That may be helpful for her sister to see that right now...you would have to gauge how you think she would handle that.
in conflicts like these, it gets political, and you really need to know who is supporting you, who is bowing out, and who is there to see your marriage end. The latter is usually only the OM. But its always circumstances to gauge. You need to find out who your friends truly are, and show them how they can help.
