Cat,

I don't know much about it but I do know that lawyers cost $$$$$$$$$$$$$$$$$.

If you can comunicate with him and tell him you would settle for 70/30. If not tell him you will fight, you will both lose a lot of money doing this. Ask him to be reasonable, maybe write everything out and give it to him. Ifhe can agree to that he is getting 20% less, but he is also eliminating a lot of lawyer fees. He may actually come out ahead by agreeing with you on the split. He has to know that even if he fights he has no guarentee of getting 50/50.

Hope that helps!