If you're going to go through with this, you need to go to a school that practically guarantees you'll be able to pay down your debt (could be $200K+) and take care of your family. I'm thinking that you'll need to start at a minimum of $125 in order to do that which may not even be comfortable. You probably really want $150+. That means top schools, basically T30 or better. With your GPA, you'll need a 165 to have a real chance.

I see you as being several steps down a very dark and very long path. I highly recommend you abandon whatever insanity possessed you to pursue this, and focus on your family. Those kids need you more than they need you to go to law school for 3 years and then work 80+ hours a week through the prime of your life and their foundational years. Ya, maybe they'll get to go to a good school and enjoy some summer vacations. But you can give them those things without going to law school. You're a father first, and everything else second.

You could stay on the IT route. Double down on your skills. Work from home even. If you have the ability to do all this LSAT stuff, you can most definitely move up in CompSci fields. Work on your skills as hard as you work on the LSAT. You could, alternatively, go back to manual labor. Mechanics, plumbers, welders—these people live comfortably with a high level of autonomy.