My thoughts are with you and your sister Annie! That guy will screw up sooner or later and be revealed for the lesser person that he really is.
Your sister's situation is similar to a plotline I saw on that new series "Boston Legal" last Sunday. On that,the wife has divorced her husband and has gotten a job opp. in another state and her husband is doing all he can to hurt her chances of custody for the boys. He too is the master of the snow job,claiming he has his boys' best intrests at heart.
One of the lawyers spots him picking up a prostitute and snaps photos of the encounter and shows up at the guy's work with the photos,threatenig blackmail if he doesn't back off.
He does of course!!!
I wish it were as easy for your sister in real life. One can only pray that the right thing is done and that justice isn't blind in this case. Tell her I wish her all the luck that exists in the Universe.
------------------
"A knight of the road,going back to a place where he might get warm."
- Borderstone