Ahhhh......the money factor.
1. See if the attorney will take a credit card.
2. See if you can get a cash advance on your credit card.
3. If you don't have one with room, apply for a new card and see if you can do it that way.
4. See if the attorney will take payments.
5. Actually -- this thought just came to mind. if you have a card -- with the room -- or get a card -- apply for SquareUp.com and become a visa payment processor. THEN charge the card to yourself and have the cash transferred into your bank account -- this is an expensive way to go but it will work. AND it will take over a week to set up, but that's another way to take a cash advance equivalent against your card without paying the higher cash advance rate on the card. (but you pay a Square processing fee (one time) etc....).
This is all not NORMAL advice for getting your hands on money that I would give to my child -- BUT when it comes to family court, the need to hire an attorney, and YOUR child -- I'd go outside the box of common financial sense and find the money.