Originally Posted by Kelli58

Well "My ex is a nutcase" is not going to work. You need to be able to prove that you have a stable home, are able to provide for all of his needs. Keep a detailed log (with dates and times) of any mistakes she makes including being late for picking up the child, forgetting medicines, ANYTHING you can think of that will discredit her ability as a parent.

Do you have a job? Great. Is it better than hers? Note that.
Do you have health insurance for the child? Does she? Whose is better?
Where is the child's doctor? If their main medical care is where you live, establish that.
If you live in a house and she an apartment or tailer that helps. They like stable homes.

If she does drugs and you don't, volunteer (on the spot) for random drug tests, knowing she can't refuse will make you look better.