Westlaw is the source lawyers use. Database of case law, especially appeal law that has not been subsequently overturned. It is subscription but if you want law that can be quoted in court you need that access. Google the net for keywords to do with custody cases. Look up divorce lawyers in your area in yellowpages.com, then go to the circuit court website in your area and search for cases by name with those lawyers names. See how they operate. Go pull their cases at the courthouse and read. Do everyone a favor and post relevent cases and excerpts and links when your case is over. Warning: you will not like most of what you find, there is a presumption against joint custody and the system is heavily weighted towards the mothers in every aspect. The only chance Dads have most of the time is if she makes big mistakes, get arrested, goes to hospital, runs off, etc. Very expensive for custody fight, 25K minimum. If she doesn't have the funds to get good legal help you might have a chance, but you could also wind up paying her lawyer. Basically it's her case to lose.