Holy crap, Tali, that is just a recipe for disaster, and the meal sounds like it's nearly cooked She's in real trouble, even if things settle down for now - what about if they have kids? It will definitely start up again then, even if it stops for now. You guys are witnesses, too, so maybe word up the local plods about what happened so that it's not news to them when she gives them a call herself...and she will. It's bad enough when it's someone you know, but worse when it's your sister, I bet.
All you can do for her whilst she decides to stay with him is to make yourself available to her and stay the hell out of his way. You can probably take out an AVO or something against him for the threats? Everyone that was threatened could do this. Though it will isolate your sis more cos I bet she won't come visit you without him Mainly cos she won't be allowed. You are right on the money, she's in a real pickle and it's only going to get worse.
Would love to see pics of the wedding, only to see how you and the bridal party looked! Maybe the whole scenario is why your BHL didn't feel it important to photographically record the event?
Uninsulated house?? ARGH! I"m glad DP insulated our house last winter - we are a good 10 deg cooler inside than out for it. Too bad Oscar broke our spray water bottle last week, I could really have done with remembering to buy a replacement yesterday!!