Get hold of those financial records as soon as is possible without him knowing.
What a bastardio - going sailing and leaving you with 4 kids! This ones not gonna like parting with the cashola, keep one step ahead of him.

I know it sounds pretty full on, but if you look at all your options and at least KNOW you don't have to put up with this, you can make a clearer decision. Sometimes having the weight of the "what happens if we split" scenario sorted can give you the time to think about what the right choice is. You need to weigh it all up for yourself.

Im not sure what would happen, but he would have to pay you some child support and I think you can claim a "spousal maintenance" thing too. You may have to call CSA or Legal Aid. You would be able to claim Govt Support (which you are entitled to as an Aust Citizen) and not be totally reliant on him. You can get various concessions on your utilities etc.

Geez, Im still shirty at the thought of him treating himself to a 4 week holiday - WTF is the $500 for? To live on for the month???