Okay.. I can offer a little insight here..
1) Your father can sell the house to someone else prior to the divorce to get it out of his name; however, then there will be public record of the proceeds from the sale, so she'll get 50% of that.
2) Dig up anything with money in it, offshore bank accounts, brokerage statements, 401k statements, receipts from his business, merchant bank statements, etc... This shows income. If he is hiding it from the IRS, I'm sure they'd like to know about it (i.e. send a lengthy fax with the docs).
3) A good PI and lawyer can work together and you'd be suprised what they'll dig up. If you father is as big an ass as you claim, I'm sure he's cheating on her, and a PI can get the photos and proof for the courts. Hence, he broke the marital contract and will pay the penalty.
4) Keep your fingers crossed for a female judge!
Good luck!
- Dave